Analysis :: Calculating A Rolling Median Over A Period Of 3 Years?

Jun 17, 2015

calculating a rolling median over a period of 3 years.

I already calculate median and I've tried to calculate rolling median over a period of 3 years as below.


What this does is, it calculates the median of the medians over the period of 3 years. But, what I'm looking for is the overall median of the underlying measure over a period of 3 years.

What I have now:

Year1 - 41,52,73;  Median1 - 52
Year2 - 6,9,12;  Median2- 9
Year3 - 24,68,89; Median3 - 68
Overall Median of 9,52,68 - 52

What I need:

Year1 - 41,52,73;  Median1 - 52
Year2 - 6,9,12;  Median2- 9
Year3 - 24,68,89; Median3 - 68

Overall Median of 41,52,73,6,9,12,24,68,89 is 41 

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Analysis :: Calculating Distinct Count Over A Period Of 3 Consecutive Years

Aug 11, 2015

I have the need to calculate a distinct count over a period of 3 years. I use the MDX  


Which works fine for all my other calculations except this, where I need a distinct count. CNT is a calculated measure. The browser would look like this:

Category Year1
Year2    ..... MDX what I have now
MDX what I need

A    A1
1 1 2 1
A2 1
0 1 1
A3 0
1 1 1

How can I achieve this?

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Calculating Median In SQL

Aug 25, 2004

Hi All,
I have a table that of server names and their execution times that run in to hundreds of thousands of records. What i need is some SQL that gives me the median execution times for each of these different servers. At the moment i have some SQL that only gives me the median for all the records in the table not the median execution time for every different server name. For example my tables looks something like this;

ServerName | ExecTime
server1 | 0.07
server2 | 0.17
server1 | 0.27
server1 | 0.37
server2 | 0.47
server1 | 0.57
server1 | 0.67
server2 | 0.77

My SQL below gives me

ServerName | ExecTime
server1 | 0.37

Where as i want

ServerName | ExecTime
server1 | 0.37
server2 | 0.47

Here is my SQL, hope someone can modify it and thanks in advance.


SELECT DISTINCT instance, exec_time AS median
FROM (SELECT instance, exec_time
FROM (SELECT TOP 1 exec_time = exec_time * 1.0, instance
FROM (SELECT TOP 50 PERCENT exec_time, instance
FROM llserverlogs
ORDER BY exec_time) sub_a
ORDER BY 1 DESC) sub_1
SELECT instance, exec_time
FROM (SELECT TOP 1 exec_time = exec_time * 1.0, instance
FROM (SELECT TOP 50 PERCENT exec_time, instance
FROM llserverlogs
ORDER BY exec_time DESC) sub_b
ORDER BY 1) sub_2)

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Calculating Median Value From Measures And Dimensions

May 24, 2007

I am facing some problem in calculating Median

I am trying to calculate the median value using one of the measures and a dimension value.

Time is a measure in my cube and OpId is one of the dimensions.The result is as follows:

opid time median

1 55

2 23

3 23

Total 23

The Time here for Op Id 1 is the aggregation for all the rows whose OpId is 1.I want the median of the values whose OpId is 1 which is not showing at the moment.

What I am getting here is the median for all of the OpId but what I really want is the median for each of the individual Opid's as well.

I am using a calculated field Median with the following expression.


( [Dim Operation].[Dim Operation].currentmember.children ,[Measures].[Elapsed Time])


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Compare The Same Period Of Different Years

May 21, 2008

Hello to everybody, I'm quite new to the Analysis Services world and would like to create a BI Solution for one of my customers with the following problem: I have sales data from the ERP from different years (2005 and on). My customer wants a report that shows the sales of the current year up to the month he wants to specify (e.g. january - march 2008) compared with the sales of the same period of the previous year (e.g. january - march 2007), divided into product category.

Is there a way to build a cube and then a matrix report in Reporting Services that lets the user specify the period for the current year and shows the same period of the previous year. Do I achieve this behaviour with a calculated member in the cube (e.g. ParallelPeriod)

Any hint (or web like example) would be very appreciated.

Best regards


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Calculating Median Values On Column In A Table

Feb 19, 2012

I need to calculate a median on a column in a table. The code I have is:

Select gender,
when gender = 'F' then 'Female'
when gender = 'M' then 'Male'
else 'Unknown'
end as test,
datediff(day, [admit_date], getdate()) as 'datediffcal',
from [tbl_record]
How do I calculate the median on the datediffcal column?

It doesn't matter if the resultset only shows the median result. So if the output shows:


that's fine. Minimally, I need the median value.

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SQL Server 2008 :: Calculating Median Over 2 Columns?

Aug 13, 2015

I have a database with 1million+ records in and i'm trying to collect the median values of column(2) for all distinct values in column (1)

Example DB:

Column 1 Column 2
978555 500
978555 502
978555 480
978555 490
978324 1111
978324 1102
978311 122
978311 120
978994 804
978320 359

and I need it to display on SELECT as

column 1 column 2
978555 495
978324 1106
978311 121
978994 804
978320 359

Is this possible on 2008 R2?

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Calculating Age In Years

Dec 19, 2001

--Use the following formula to calculate a person's age in years in a stored procedure,
--where @dob is the person's date of birth and @yyyymmdd is the date on which to determine the age:

DECLARE @age int
DECLARE @dob datetime
DECLARE @yyyymmdd varchar(11)

SELECT @dob = '12/06/1966'
SELECT @yyyymmdd = GETDATE()
SELECT @age = FLOOR(DATEDIFF(day, @dob, @yyyymmdd) / 365.25)
PRINT CONVERT(varchar, @age)

--Substitute "getdate()" for the @yyyymmdd variable if you want to determine the person's age right now.
--The function divides by 365.25 to allow for leap years and uses the FLOOR function to make sure the function returns an integer.
--The function DATEDIFF(year, @dob, @yyyymmdd) doesn't work because Microsoft chose to implement
--the "year" part of the function to calculate the number of year boundaries crossed.

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Asking For Help With Distinct Count Within Rolling Period...

May 22, 2008

Thanks for taking the time to read my post. I greatly appreciate it!

What i'm trying to do is get a distinct count of account numbers within a rolling period. My actual take is rather large but i've created a smaller-like version below. Please reference this table.




















Let's say i want to return distinct count of accounts within a 2-month rolling period meaning in February, i'd get a distinct count for accounts in January & February, then in March i'd get a distinct count for February & March, then in April i'd get it for March & April, and so on... my results table would like the table below:







I had asked this before but it was a summing equation and not a unique count. I've tried to play with the summing equation to kind of make it work, but i'm starting to get a headache. It's probably so simple!

Here's my previous post:

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Pls Help W/ A Query To Return Running Balances From The Previous Rolling 3 Month Period.

Oct 18, 2007

Please refer to this table in this discussion:


























What i'm trying to do is return a result with total charges from 3 months previous based on a date parameter or just as a whole for that matter. For example:

If my date parameter is 6/14/07, i'd like my total charges to be 15 (6+5+4).
If my date parameter is 7/10/07, the charges would be 18 (7+6+5)

I hope that makes sense of where i'm going with this. I've played with this using the "Guru's Guide" solution by Ken Henderson, but still to no avail yet. Here's his code syntax:

Code Block

SELECT a.DayCount, a.Sales, SUM(b.Sales)
FROM Sales a CROSS JOIN Sales b
WHERE (b.DayCount <= a.DayCount) AS RunningTotal
GROUP BY a.DayCount,a.Sales
ORDER BY a.DayCount,a.Sales
Here is the result set i'm looking for:


























Each date's charges are a culmination of 3 months worth of charges.

Any help would be greatly appreciated. I'll be trying to figure this one out concurrently and if i do, i'll post back!

Thanks in advance!

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Power Pivot :: Calculating Sum Of A Measure Over Rolling 6 Months?

May 4, 2015

I am trying to calculate the sum of gross sales over a rolling 6 month period in PowerPivot and don't even know how to start.

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SQL Server 2012 :: Query - Counting Item Occurrence Over A Rolling 72 Hour Period

Jun 18, 2015

I am using MS SQL 2012 and have a pretty simple table dbo. Migration Breakdown with sample data as follows.

DepartDateTime ZoneMovement
2015-06-26 14:00:00.000 6 to 4
2015-06-26 14:00:00.000 11 to 7
2015-06-26 15:30:00.000 9 to 6
2015-06-26 21:00:00.000 7 to 3
2015-06-27 08:01:00.000 7 to 4


What I am trying to do is parse the data set to find out when we have more than three like movements ex. 3 to 10 within ANY rolling 72 hour period. I have looked at the SQL Window Functions OVER with a ROW | RANGE subclause, but I can't find out how to tackle this rolling 72 hour business.

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Analysis :: Median Calculation Using MDX

May 28, 2015

 I have a fact table fct_line_details having two columns mtid, productivity

  mtid     productivity
  1           400
1           200
1          600
2          700
3         900

I want to calculate the median for each mtid in SSAS . (median for mtid 1=400 )

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Calculating Avg Of Days Broken Down By Period

Nov 28, 2013

Aim – Calculate the number of days between CreatedDate and [Date_Docs_In_Complete__c],count how many Ids, Fall within a specific month by year, and then work out the avg number of days it took for each month

My query so far

left(CreatedDate,10) as CreatedDate,
left([Date_Docs_In_Complete__c],10) as [Date_Docs_In_Complete__c],
DATEDIFF(day,CreatedDate,[Date_Docs_In_Complete__c]) as Days
from #build

Produces following results


Desired outcome results would be

Year Month Date_Docs_In_Complete__c Total Days Avg_Days
2013 07 3 2539846.3

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Analysis :: MDX Multiple Years On Columns

Nov 5, 2015

Using 'TAIL([Time].[Time].[Year].MEMBERS,1)' I can get the current year dynamically.  My question is how do I get the previous two years dynamically as well.  I've tried a few different ways with no luck.  As you can see below I'd like to replace 2014 and 2013 with current year -1 and current year -2.

{[Branches].[Branches].[Region]*[Measures].[Ship Resale S&D Run Rate]} ON ROWS

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Analysis :: Calculate Percentage Difference Of Two Values From Selected Years

Aug 31, 2015

Developing a measure which displays the difference of two values from the selected years.

An example : Show the difference of the sales amount from 2013 and 2015.

Since i am not really into mdx or calculated members.

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Analysis :: Parallel Period Sliced By Other Dimensions

Aug 4, 2015

I have make a calculated member for previous period of an given date range.  The previous period is the same date range from the previous year, and I have managed to achieve that with the calculated member:

Create member currentcube.[Measures].[PrevPeriod] as
(ParallelPeriod( [Start Date].[Cal Hierarchy].[Year], 1, [Start Date].[CAL Hierarchy].CurrentMember), [Measures].[Count]);

This member returns the correct result as long as my query uses the time dimension, which makes sense... but I also need to show results sliced by other dimensions in bar charts that do not display the time dimension.  For example, I have a dimension with only 3 members called [Region].[Area].[AreaName].

The result set for the bar chart needs to look like this:

[AreaName] | [Count] | [PrevPeriod]
East            |    43      |       56
West           |    53      |       95

But the [PrevPeriod] only returns values if I include the time dimension.  I essentially need to sum the results of the time dimension/AreaName/[PrevPeriod] tuple down to just Areaname/[PrevPeriod] for whatever date range may be involved.

I don't know if this is significant to the issue, but the client tool that generates the bar charts builds the query with the date range as a subcube in the FROM statement.  If the [PrevPeriod] is outside of the subcube that is still OK, as long as the time dimension is included in an Axis on the final select statement, so at least I know I am not suffering from the members inside the subcube.  I've also found in SSMS that it makes no difference if I make the query a subcube, or put the date range in a where clause instead;  I still get NULL for [PrevPeriod] without the dates.

I can't imagine that this is an unusual situation, so I hope I've explained it adequately!  What is the recommended technique for summarizing a Parallelperiod by dimensions without displaying the time/dates ?

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Analysis :: Closing Period With Date Dimension

Aug 11, 2010

I have a date dimension with below Hieararchy:


Week is the lowest granular attribute.

Also i have a measure 'Holdings'

I would like to create calculated measure which should give me closing holdings at all levels(week ,Month,Quarter and year levels.) whichever i pull in the browse pane.

Below calculated measure would show the holdings for whatever the level you have specified.

ClosingPeriod( [DIM BI DATE].[Calendar].[WEEK], [DIM BI DATE].[Calendar].CurrentMember

But this measure shows the value for only week attribute.

for month,([Measures].[Holdings],ClosingPeriod( [DIM BI DATE].[Calendar].[Month],
[DIM BI DATE].[Calendar].CurrentMember ))

But my aim is to create a calculated measure to give closing value for any level.

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Analysis :: Total Calculation With Filter For Parallel Period

Nov 30, 2015

I have developed a cube in my work place for analyzing current year sales with previous year sales in Time Hierarchy (Year- Quarter- Month) using Parallel period. If we want to see data for particular Quarters i.e. Q1 and Q2 then total at the year level should also get change. Currently if we only choose 2 quarters in the filter then current year data gets change, however data using parallel period is not getting change accordingly and its shows Total of full year.

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Analysis :: Parallel-period Equivalent For A Time Range?

Jan 27, 2009

Our client wants to report on their trade volume for last year as compared to the current quarter. For simplicity let's pretend they have a report where they have a two key measures:

[Trade Volume - Tons]
[Trade Volume - Tons MTD]
[Trade Volume - Tons]

is based on outlook - that is, for any period we are reporting on the trade volume will be reported as actuals that have been loaded up until the current period, and forecast for the current and future periods.

[Trade Volume - Tons MTD] is based only on actuals - that is for any period we are reporting on the trade volume will be reported as actuals that have been loaded up until and including the current period, and 0 for any future periods.

If Feb09 is our current period, and we are using quarter on the time dimension (where quarter 1=Jan09,Feb09,Mar09) and we have the following data:

Jan09 Trade Volume Actual: 100 Trade Volume Forecast: 150
Feb09 Trade Volume Actual: 50 Trade Volume Forecast: 200
March09 Trade Volume Actual: 75 Trade Volume Forecast: 225


[Trade Volume - Tons]=100+200+225=525
[Trade Volume - Tons MTD]=100+50=150

This is a problem, because the comparison with their current results ([Trade Volume - Tons MTD]) with what they 'forecast' ([Trade Volume - Tons]) is not based on the same period of time - we are comparing the sum of two periods versus three periods.To solve this we changed the reporting period to be monthly granularity, and now select Jan09-Feb09 as our range (as opposed to having a quarter granularity and selecting Q1,2009 in the example above).

This works well and produces the expected results:

[Trade Volume - Tons]=100+200=350
[Trade Volume - Tons MTD]=100+50=150

However, this introduces a secondary problem: we are doing a prior year calculation on the Trade Volume also, so the users can compare how the actuals are comparing to the same period last year.To do this we use the following formula for the prior year calculation:

Prior Year Actuals=([Measures].[Trade Volume - Tons], ParallelPeriod([Time].[544 Hierarchy].[Period Year],1,[Time].[544 Hierarchy].currentmember))

The problem is as soon as we move from quarter granularity to (monthly granularity AND select more than one monthly period) the Prior Year Actuals calculation produces a an error "The MDX function CURRENTMEMBER failed because the coordinate for the 'Period Year' attribute contains a set".So, ParallelPeriod does not like it when currentmember is a range (Jan09,Feb09) rather than a single period (Jan09).

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Analysis :: SSAS Time Period Dimension Aggregation

Jul 27, 2015

I have a monthly time period dimension representing average number of students for each month. At the yearly aggregate level I don't want it to sum up the avg number of students from every month because that number is incorrect. I would like it to use the number of students from the most recent month as a roll up. Is that possible to configure in SSAS?

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SQL Server 2012 :: Sales Over Years - Retrieve Values In Single Query For Multiple Years And Grand Total?

Apr 24, 2015

I need to list customers in a table that represents sales over the years.

I have tables:

Customers -> id | name |...
Orders -> id | idCustomer | date | ...
Products -> id | idOrder | unitprice | quantity | ...

I am using this SQL but it only gets one year:

SELECT , SUM(unitprice*qt) AS total
FROM Products
INNER JOIN Orders ON = Products.idOrder
INNER JOIN Customers ON = Orders.idCustomer
WHERE year(date)=2014

I need something like this:

customer | total sales 204 | total sales | 2015 | total sales (2014 + 2015)
customer A | 1000$ | 2000$ | 3000$
customer B | 100$ | 100$ | 200$

Is it possible to retrieve these values in a single SQL query for multiple years and grand total?

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Analysis :: How To Create Parallel Period For Multiple Measures In SSAS 2012

Mar 27, 2012

I am trying to create a calculated member for parallel period function using ssas 2012. I have 10 measures for which i need to create parallelperiod. 

I can successfully create for 1 measure but when i add multiple values to it it breaks. Below is the sample i tried for multiple measures:

sum(ParallelPeriod([Date].[Calendar].[year],1,[Date].[Calendar].currentmember) ,

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Analysis :: Comparing 2 Years Data Side By Side?

Apr 24, 2015

When I try compare 2 years worth of data side by side. They go in separate grids. I know it is just a usability feature.

i would want see same month data for multiple years side by side.

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Last Period As Initial Value But Still Have Period As Parameter?

Jan 3, 2007

Hi all,

I'm using an olap cube in a report (dash board).
The last "actual" period should be viewed when the user opens the report. I'm using the MDX tail function for that.
Once the report is opened the users want to select another period. Then I want to put period as a parameter.
But that is not possible since the parameter check box is no longer available when using a MDX filter expression.

Is there any solution to this problem?

Any help will be appreciated.

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Better Median??

Dec 7, 2002

I recently had to use my own little median technique again on a report here at work, and had posted it before, but wasn't sure if anyone had seen it. I have read Celko's and others techniques for generating a median and haven't seen one more efficent.

Does anyone have a better way they can think of? I think this bad boy is pretty short & efficient.

First, if you want to return the middle number or the higher one next to the middle if there is an even number:

SELECT x.Value AS median
FROM Vals x
GROUP BY x.Value
HAVING SUM(SIGN(x.Value-y.Value)) IN (1,0)

Change the " IN (1,0)" to "IN (-1,0)" to get the lower value if there is an even # of values.

Basically, we are saying compare each number to all possible numbers, and add up values of 1,0 or -1 depending if the first number is less, equal or higher than the second. The number that returns 0 is right in the middle ... If there is no middle, a -1 or 1 is returned. There will never be a 0 and (-1 or 1) at the same time returned.

To get the financial median (avg of the 2 values middle values if there is an even number), you need to encapsulate the results of the above into a subquery, allow for not just (-1,0) but all three (-1,0,1) and then take the AVG of the values returned.

That is,

SELECT Avg(Median) as Median FROM
SELECT x.Value AS median
FROM Vals x
GROUP BY x.Value
HAVING SUM(SIGN(x.Value-y.Value)) IN (1,0,-1)
) A

If there is an even number of values, the lower and higher middle ones are averaged. If there is an odd number, only the middle value is returned and averaged (which of course has no effect).

Most other techniques used several COUNT(*) subqueries which this one avoids.

Critique and enjoy!

- Jeff

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New To SQL, Need To Get The Median Value

Sep 27, 2007

I have a table that contains the following:
customer (ID of customers)
product (Product description numeric value)
UOM (unit of measure like each or pak)
avgprice (Avg proce that this product and uom was sold)

I need to find the median value for a product, uom. Then I need create a table that shows product,uom,avgprice,median grouped by product and uom
I have been at this for two days with no luck

Thanks in advance for any help

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How To Find The Median?

Jan 28, 2006

I've noticed that SQL Server (and other DBMSs I've looked at) doesn't seem to have a built-in function for finding the median of a range of numbers.


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Median Function

Sep 28, 2006

I have a long term need for a median function, I was wondering if anyone has or knows of some code or user defined functions somewhere that would do this. Ideally you could use it just liket the rest of the aggregate functions like AVG, etc.

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Finding Median Value

Mar 12, 2007


I have looked all over the web to try to find some very basic / simple explanations of how to get a median value from a group of records in a table but with no luck

the problem i am having is that all the information i find is always centered around getting a median using every single row in the table. except i have groups of data in the table and want to work out a median for each group. the group is identified by 4 different columns (the 5th column is what i want to get the median on but for each group not the entire table) and i want to produce a resulting table that has 1 row for each group and therefore contains the median value for the group instead of the individual numbers that it currently has. e.g. the current table is like this

column1 column2 column3 column 4 column5(median of this)

value 1 value 2 value 3 value 4 1.2
value 1 value 2 value 3 value 4 1.0
value 1 value 2 value 3 value 4 1.5
value 2 value 3 value 4 value 5 0.2
value 2 value 3 value 4 value 5 0.4

and i need a query to get the results to show like this

column1 column2 column3 column 4 column5

value 1 value 2 value 3 value 4 1.0
value 2 value 3 value 4 value 5 0.3

This is driving me crazy and i will be very helpful if anyone can help

the statement i need to add it to is:

select pat_demid, pat_lastname, meas_gendate, meas_id, test_gendate, avg(srtot)as meansrtot, avg(sreff)as meansreff, avg(BFRaw)as BF_Rawmean, avg(BFTGV)as BF_TGVmean, count(srtot)as countsrtot, count(sreff)as countsreff
from bodyparametersf
where (srtot is not null) OR (sreff is not null)
group by pat_demid, pat_lastname, meas_gendate, meas_id, test_gendate

thanks very much

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Calculate Median!!!

May 29, 2007

I need to calculate Median on each calculated result from the query below. There is one Median function available in SQL2K but it is not working. Can anyone help me in this regard.

SELECT INS.Code As [code],INS.FinYr as [YEAR], ' ' As [FIRE BUSINESS], (INSRev.FI_NetPremLessIns / INSRev.FI_GrPremium) * 100 As [Rention Ratio],
(INSRev.FI_NetClaimPaid/INSRev.FI_AdjNetPremium)*100 As [Claim Ratio], ((INSRev.FI_AgencyCommPaid+INSRev.FI_ReInsCommPaid+INSRev.FI_MgmtExpenses+INSRev.FI_OthExpenses)/INSRev.FI_AdjNetPremium)*100 As [Expense Ratio],
((INSRev.FI_NetClaimPaid/INSRev.FI_AdjNetPremium)*100)+(((INSRev.FI_AgencyCommPaid+INSRev.FI_ReInsCommPaid+INSRev.FI_MgmtExpe nses+INSRev.FI_OthExpenses)/INSRev.FI_AdjNetPremium)*100) As [Combine Ratio],
(INSRev.FI_ClosingBal/INSRev.FI_NetClaimPaid) As [Unexpired Risk Reserve to Net Claim(x)],(INSRev.FI_MgmtExpenses/INSRev.FI_AdjNetPremium)*100 As [Management Expenses to Adj. Net Premium],
(INSRev.FI_AgencyCommPaid/INSRev.FI_AdjNetPremium)*100 As [Agency Commissioned to Adj. Net Premium]

(InsuranceGen As INS LEFT JOIN INSURANCEGen As INS1 ON (INS1.FinYr=INS.FinYr-1 AND INS.Code=INS1.Code))


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Median Function

Sep 7, 2007

Im trying to find a funtion for median's if there is one. can anyone help?

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Calculate Median LTM

Apr 22, 2008

Using SQL Server 2005, I have the following query to calculate the median sales of each quarter over the past 5 years:

WITH CompMedian AS


SELECT SoldDate, SoldPrice, ROW_NUMBER() OVER(PARTITION BY Convert(Varchar(5),Year(SoldDate)) + Convert(Varchar(5), RIGHT(CAST(100+DATEPART(QQ,SoldDate) AS CHAR(3)), 2)) ORDER BY SoldPrice) AS RowNum, COUNT(*) OVER(PARTITION BY Convert(Varchar(5),Year(SoldDate)) + Convert(Varchar(5), RIGHT(CAST(100+DATEPART(QQ,SoldDate) AS CHAR(3)), 2))) AS Cnt FROM tbl_Orders
WHERE Status = 'Sold'

AND SoldDate >= DATEADD(Year, -5, Convert(DateTime, Convert(Varchar(5),Month(GetDate())) + Convert(Varchar(5), '/1/') + Convert(Varchar(5), YEAR(GetDate()))))

AND SoldDate < DATEADD(Year, 0, Convert(DateTime, Convert(Varchar(5),Month(GetDate())) + Convert(Varchar(5), '/1/') + Convert(Varchar(5), YEAR(GetDate()))))

SELECT Convert(Varchar(5),Year(SoldDate)) + Convert(Varchar(5), RIGHT(CAST(100+DATEPART(QQ,SoldDate) AS CHAR(3)), 2)) AS CompDate, AVG(SoldPrice) AS CompMedian

FROM CompMedian

WHERE RowNum IN((Cnt + 1) / 2, (Cnt + 2) / 2)

GROUP BY Convert(Varchar(5),Year(SoldDate)) + Convert(Varchar(5), RIGHT(CAST(100+DATEPART(QQ,SoldDate) AS CHAR(3)), 2))

ORDER BY CompDate;

Now my client would like me to change the query so that each quarter would represent the median for the past 12 months ending with that quarter. I've been looking at this for hours and I'm at a loss. Anyone have any thoughts?

Thanks in advance,

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