Average of a subset of data

Post Author: squishy
CA Forum: Formula
I need to find a way to get the average of a subset of data
in a report.
For example
The datasource returns:
User
Month          Current
Bob           mar                10
Janet         mar                  5
James        mar                 24
Bob           feb                12
Janet         feb                  4
James        feb                 22
Bob           Jan                14
Janet         Jan                  3
James        Jan                 30
I need the report to
show in addition to the current value for march for each user, the average of
the previous two months
So the report would actually show:
User
Month          Current        Average
Bob           mar                10                13
Janet         mar                  5                  3.5
James        mar                 24                26
Is there a way to get crystal to calculate the average for
the previous two months for each user?

Brad
The calculations are for Emission calculations for vehicles. The main input data set is a second-by-second file containing many channels / groups. For a number of the raw channels (eg distance) the raw data is first integrated and then analyzed into a series of windows
oDistanceWindow(iLoop) = ODistanceInt(iPos) - ODistanceInt(iLoop)
Each window is defined by a start (iloop) and end index (ipos) referencing.Each result is then added to an output group.
However my problem is I want to calculate a statistical parameter for each of these sub-groups of data and generate an output group with these results. An example being the mean speed. This is not a good example since this can be calcuated easily by dividing the distance and time already being calculated.
I hope this helps
David

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I have attahced an illustration.
Tim
Solved!
Go to Solution.
Attachments:
plot.jpg ‏173 KB

Hey smoothdurban,
I've seen Brad's code, and trust me, it's worth the effort to let him help you get it up and running - it's definitely the most ideal way to solve this problem. However, as Brad said, there are multiple ways to tackle this - both interactive and programmatic - so in the meantime, I'll take a second to detail one of the interactive and sure-fire ways to find the average of data between two points on a single channel.
We'll use"Flags." Set up your VIEW graph exactly as you did on your original screenshot, using Band Cursors to approximate the beginning and ending X-values representing the range you want to examine. Next:
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This account is no longer active. Contact ShadesOfGray for current posts and information.
Attachments:
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Returning Random Row based on Subset of Data within Table

Hi,
Please see below. Running SQL Server 2008 R2.
Sample DDL:
CREATE TABLE [dbo].[TestPersons]
[TestPersonID] [int] NOT NULL IDENTITY(1,1),
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PAD_INDEX = OFF,
STATISTICS_NORECOMPUTE = OFF,
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ALLOW_ROW_LOCKS = ON,
ALLOW_PAGE_LOCKS = ON
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ON [PRIMARY]
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Best Regards
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DECLARE @TestPersons TABLE (TestPersonID int NOT NULL IDENTITY(1,1), FirstName varchar(50), LastName varchar(50), AreaID varchar(50))
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('Christopher', 'Smith', 'A0001'), ('Brian', 'Speakman', 'A0001'), ('Harold', 'Clark', 'A0009'), ('Tim', 'Henson', 'A0009'), ('Victor', 'Chilson', 'A0009')
;WITH subset AS (
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FROM @TestPersons
WHERE FirstName LIKE '%e%'
SELECT *
FROM subset
WHERE sID = round((((SELECT COUNT(*) FROM subset) - 1 - 1)*rand())+1,0)
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Filtering and calculating averages of array subsets

I've got a 2-D array coming out of a loop and I need to calculate average for subsets corresponding to iterations 0-9, 10-19, etc.. Additionally, I need to filter out values above and below acceptable limits before calculating average. Any suggestions for how to approach this?
Solved!
Go to Solution.

My suggestion is to slog through each array subset, use a for loop to add up the values you want, keep track of the number of values, then divide out for the average.
Every tenth reading you could clear the sum and counts.
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You could keep track of the one to ten value separately from the number of values accepted ( a.k.a. Filtering).
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The filter criteria would produce a Boolean that would toggle adding to the sum and adding to the # accepted values.
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hi all
I have a work of estimating the average row size of some tables. Because I don't want to populate these tables with data(It's alot work to do it),so I am not able to get the arerage row size from dba_tables by analyzing these tables.
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Hi,
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Is that you are looking for?
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When you see answers and helpful posts, please click Vote As Helpful, Propose As Answer, and/or Mark As Answer.
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Hello
For instance, you may try something like the following tables.
Table 1 (excerpt)
A1 Surname
A2 A
A3 B
A4 A
A5 A
B1 Pay
B2 10
B3 20
B4 20
B5 10
C1 ordinal
C2 =COUNTIF(A$2:A2,A2)
C3 =COUNTIF(A$2:A3,A3)
C4 =COUNTIF(A$2:A4,A4)
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Table 2 (excerpt)
A1 Surname
A2 =IFERROR(INDEX(Table 1::A,C2,1),"")
A3 =IFERROR(INDEX(Table 1::A,C3,1),"")
A4 =IFERROR(INDEX(Table 1::A,C4,1),"")
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C5 =IFERROR(MATCH(1,OFFSET(Table 1::C,C4,0,ROWS(Table 1::C)-C4,1),0)+C4,"")
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Table 1::C is to record ordinal number per distinct name in Table 1::A.
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Hope this may help,
H
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