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Find an average on another sheet

Hi guys,

I need to populate a sheet on Excel with averages in 24 hours blocks. I have a sheet with raw data every 30 minutes and another "averages" sheet where I write the "FROM" and "TO" dates (usually 24 hours range) and then the averages for all columns in the other sheet (48 cells in each average as the data is grabbed every 30 minutes).

Example Data Sheet:
06/01/2013 06:00 AM      5      10
06/01/2013 06:30 AM      4      12
06/01/2013 07:00 AM      3      11
06/01/2013 07:30 AM      5      09
................

Example Averages Sheet:
From 06/01/2013 06:00 AM To 06/02/2013 06:00 AM      4.5      11.5
................


Why does AVERAGE with two VLOOKUPs doesn't work? It works if I write a comma separating the two numbers and make an average between them but not if I use ":" to average a series of data between those two VLOOKUPs. Any ideas?

Thanks in advance!
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Cesar Aracena
Asked:
Cesar Aracena
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1 Solution
 
FaustulusCommented:
VLOOKUP returns a value, not a range. The colon is used to define a starting and ending cell of a range. Since VLOOKUP doesn't return that kind of result (cells or ranges) it also can't work with the colon. However, you can enumerate values in the AVERAGE function, separating them by commas. That is why two values - in this case each returned by a VLOOKUP function - can be averaged if separated by commas.
In order to set a dynamic range from which to extract an average you may like to consider using INDEX to define the range and MATCH to specify rows depending upon their content.
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Cesar AracenaPHP EnthusiastAuthor Commented:
Thanks Faustulus. The problem is that I need to average all numbers between two given dates and all of that is in another sheet. Can it be done automatically?
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FaustulusCommented:
Can you post some data for me to test on?
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Cesar AracenaPHP EnthusiastAuthor Commented:
I've created a new book with a simple sample. In the second sheet you can see I have the real average but it's written by me. I need it to calculate it on itself from the first sheet as I enter the dates.

Thanks again!!!
Book1.xlsx
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FaustulusCommented:
Please try this formula in your cell Averages!D1
=IFERROR(AVERAGE(INDIRECT(ADDRESS(MATCH($A$1,'RAW DATA'!$A:$A,1),2,1,1,"Raw Data")&":"&ADDRESS(MATCH($B$1,'RAW DATA'!$A:$A,1),2))),"")

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Observe that the two MATCH functions both look for the same of nearest smaller value as indicated by the final 1 in MATCH($A$1,'RAW DATA'!$A:$A,1). If you change the 1 into 0 an exact match would be required. If such a match wouldn't be found an error yould result and no average would be returned.
Note that your formula in C1 could be simplified into =IF(AND(A1,B1),(B1-A1)*24,"")
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Cesar AracenaPHP EnthusiastAuthor Commented:
Great answer! I couldn't find this ever! Thanks...
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