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Averaging Monthly Sum in Crosstab

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Rod asked on 12 Nov 2012, 07:13 PM
I have a crosstab tab that sums up the amount sold during a month. This works very well. I want to average the monthly sum but only using month that have a non-zero amount sold.

For example:

Product      May   Jun   Jul   Avg
123             10      9        8      9
124             15     -        10   12.5
125               6     10      12     9.333
126               -        -         7     7

So product 124 is divided by 2 instead of 3 and product 123 divided by 1.

I have looked at the forums and used google but I cannot figure out how to do this. Any help would be greatly appreciated.

ROD>

5 Answers, 1 is accepted

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Peter
Telerik team
answered on 13 Nov 2012, 09:13 AM
Hi ROD,

Our suggestion is to use a conditional expression as shown in the following example:
= Avg(IIF(Fields.Value<>0, Fields.Value, null))

All the best,
Peter
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Rod
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answered on 13 Nov 2012, 08:25 PM
Peter,

I understand what you are proposing, what I cannot seem to figure out is how to count the non-zero columns. I am able to use EXEC to get the total sum for the row just fine.

Please see the tonnagereport.jpg. I need to count the non-zero columns in the red circled sum for my average. I cannot seem to access that value easily.

Thank you,
ROD>
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Peter
Telerik team
answered on 14 Nov 2012, 11:32 AM
Hi Rod,

You can accomplish your requirement with a custom aggregate function that counts only the months that have value bigger than zero as shown the following example:

= Sum(Fields.MTWeight)/CountX(Fields.Month, Fields.MTWeight)

`namespace ``Telerik.Reporting.Examples.CSharp`
`{`
`    ``using ``System;`
`    ``using ``System.Collections.Generic;`
`    ``using ``System.Text;`
`    ``using ``Telerik.Reporting.Expressions;`

`    ``class ``CountX : IAggregateFunction`
`    ``{`
`        ``List<``int``> validMonths;`

`        ``void ``IAggregateFunction.Init()`
`        ``{`
`            ``this``.validMonths = ``new ``List<``int``>();`
`        ``}`

`        ``void ``IAggregateFunction.Accumulate(``object``[] values)`
`        ``{`
`            ``var month = (``int``)values[0];`
`            ``var value = (``int``)values[1];`
`            ``if ``(value > 0)`
`            ``{`
`                ``if ``(!``this``.validMonths.Contains(month))`
`                ``{`
`                    ``this``.validMonths.Add(month);`
`                ``}`
`            ``}`
`        ``}`

`        ``object ``IAggregateFunction.GetValue()`
`        ``{`
`            ``return ``this``.validMonths.Count;`
`        ``}`

`        ``void ``IAggregateFunction.Merge(IAggregateFunction aggregateFunction)`
`        ``{`
`            ``var countX = (CountX)aggregateFunction;`
`            ``foreach``(var month ``in ``countX.validMonths)`
`            ``{`
`                ``if ``(!``this``.validMonths.Contains(month))`
`                ``{`
`                    ``this``.validMonths.Add(month);`
`                ``}`
`            ``}`
`        ``}`
`    ``}`
`}`

Kind regards,
Peter
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Rod
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answered on 14 Nov 2012, 05:16 PM
Peter,

Thank you. I was making this much more complicated that it had to be. I was able to get the result I needed with a much more simplified expression.

I added a column to the right outside of the group and used the following expression:

`=Sum(Fields.MTWeight)/CountDistinct(Fields.RequiredDate.Month)`

The CountDistinct works since no data will be returned for that month if there are no sales. I have not tested this but  there could be an issue if more than 12 months of data is pulled which I think would be unusual for this client.

It was your formula for accessing the month field that gave me the idea.  Thank you so much for the super quick responses. I will have one happy client now.

ROD>

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May Zin
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answered on 23 Dec 2016, 12:00 PM

Hi!

This example is very good answer for us but I have a few difficulty for use this example.

When I use this example on crystal report, I face the error on avg formula.

IIF(Fields.Value<>0, Fields.Value, null)

Above the formula, How can I write to attach "the average function" on crystal report?

When I wirte, I face the error "Does not match with avg formula".

So Give me guideline how to write the formula on the crystal.

Thanks. I hope the reply letter from you.

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