That is because array formuals cannot work on whole columns. Try setting a
range like:

=AVERAGE(IF(A1:A1000="Start of Day",B1:B1000))

--
HTH

Sandy
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"Gaurav" wrote in message
...
Actually it gives me a 0 if i press enter and a #NUM! error if i press
CTRL+SHIFT+ENTER

"John Bundy" (remove) wrote in message
...
That is what is known as an array formula, when you are done, instead of
just
hitting enter, you have to hit CTRL+Shift+Enter. If you did it right you
should se a {} around your formula.
--
-John
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"Gaurav" wrote:

Hi All,

I am trying to take out the average of all the values in column B which
have
"Start of Day" in Coumn A. I tried =AVERAGE(IF(A:A="Start of Day",B:B))
but
doesnt work...need help.

Thanks
Gaurav