I need an average for certain criteria in Excel 2007

I am trying to find an average number of days it takes to complete a task.

Column A has the agent name
column B has the date assigned
Column C has the date completed.

I want to average up the information for say, Agent John Smith across a large range. I will be referencing the agent names by a list in a cell range so i would need it to refernce A5 for "John Smith" (I have 183 agents so I dont want to have to type their names in a formula.

Thanks!
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wrt1meaAsked:
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barry houdiniConnect With a Mentor Commented:
Have you confirmed with CTRL+SHIFT+ENTER?

You can see that in my example - the formulas display enclosed in curly braces like { and }

To do that select the first cell with the formula, press F2 to select formula then hold down CTRL and SHIFT keys and press ENTER, you should then see the curly braces and get a result....

If you don't have both dates what do you want to do? If you want to ignore those rows completely then you can try another "array formula", i.e.

=AVERAGE(IF(Data!A$2:A$1000=A5,IF(Data!C$2:C$1000<>"",Data!C$2:C$1000-Data!B$2:B$1000)))

again, with CTRL+SHIFT+ENTER

or to avoid array formulas you can use AVERAGEIFS functions like this

=AVERAGEIFS(Data!C$2:C$1000,Data!A$2:A$1000,A5,Data!C$2:C$1000,"<>")-AVERAGEIFS(Data!B$2:B$1000,Data!A$2:A$1000,A5,Data!C$2:C$1000,"<>")

which also ignores rows that don't have a completion date

regards, barry
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barry houdiniCommented:
Assuming you have data on data worksheet then try like this

=AVERAGE(IF(Data!A$2:A$1000=A5,Data!C$2:C$1000-Data!B$2:B$1000))

confirmed with CTRL+SHIFT+ENTER

assumes that all rows have both dates.....

regards, barry
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barry houdiniCommented:
Here's an example of the above suggestion.....

regards, barry
26823898.xlsx
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wrt1meaAuthor Commented:
what if all the rows do not have both dates? I am returning an "#N/A"
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wrt1meaAuthor Commented:
OK, the "#N/A" error was due to me not adding another zero to the range fro A, B, & C....

I was able to correct that, but the value is coming up 0" for everything
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wrt1meaAuthor Commented:
=AVERAGEIFS(Data!C$2:C$1000,Data!A$2:A$1000,A5,Data!C$2:C$1000,"<>")-AVERAGEIFS(Data!B$2:B$1000,Data!A$2:A$1000,A5,Data!C$2:C$1000,"<>")


Works great! Thanks for the help!
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