Average only with specific critera

[Guest]

Hi. I am trying to average a set of numbers but only if the number in the
column to the left is equal to 1. For example:

b1:b100 I have either the number 1, 2, 3, or 4,
c1:c100 I have percentages

I want to average only the percentages that have a 1 to the left of it in
the b column.

Thanks in advance...

 

[Guest]

Try this:

=SUMIF(B1:B100,1,C1:C100)/COUNTIF(B1:B100,1)

Does that help?
***********
Regards,
Ron

XL2002, WinXP

 

[Guest]

You can use the following:
=SUMPRODUCT(--(B1:B100=1),C1:C100)/COUNTIF(B1:B100,1)

Hope this helps,
Miguel.

 

[Guest]

Thank you, I did get it to work.

How would I do it if I want to average the percentages if either 1 or 2 were
in the b column?

Thanks in advance.

 

[Guest]

Try this:

=SUMPRODUCT(SUMIF(B1:B100,{1,2},C1:C100))/SUMPRODUCT(COUNTIF(B1:B100,{1,2}))

Is that something you can work with?
***********
Regards,
Ron

XL2002, WinXP

 

[Guest]

Hi. The problem is that I have a column for each number on the left side.
For example:

b1:b100 - 1, 2, 3, or 4
c1:c100 - percentages that work with 1 or 3
d1:d100 - percentages that work with 2 or 4

I want to be able to average the percentages that correlate with 1 and 2. So
when I did the formula I used (c1:d100) and when C was 1, it would average C
and D, instead of just c. As D would have been blank it averaged C and 0. Is
there a way for the formula to ignore blanks?

Thanks again.

 

[Guest]

Maybe one of these?:

=(SUMPRODUCT((B1:B100=1)*C1:C100)+SUMPRODUCT((B1:B100=2)*D1100))/SUMPRODUCT(COUNTIF(B1:B100,{1,2}))

or

=SUMPRODUCT((B1:B10={1,2})*C110)/SUMPRODUCT(COUNTIF(B1:B10,{1,2}))

Does that help?
***********
Regards,
Ron

XL2002, WinXP

 

[Don Guillett]

You can also use the ARRAY formula which must be entered with
ctrl+shift+enter vs just enter

=AVERAGE(IF(B2:B100=1,C2:C100))

 

[Guest]

Yes, thanks everyone for the help!