adding a 3rd criteria to an IF formula

[GD]

Hi, just reffirming my request for help in adding a 3rd criteria to the below
formula, can't for the life of me get it sorted! cheers

=SUM(IF(MOD(ROW('2008 Errors'!$A$3:$A$3000),10)=3,IF((YEAR('2008
Errors'!$A$3:$A$3000)=2008)*(MONTH('2008 Errors'!$A$3:$A$3000)=1)*
(LEN('2008 Errors'!P33000)-LEN(SUBSTITUTE('2008
Errors'!P33000,"KT",""))>0),1)))

I'm looking to add a 3rd criteria dependand on a further range of cells
('2008 Errors'!B3:B3000) with the
text "Fax" occuring in them (and in the month of January in A3-A3000 and
"KT" in P33000 as detailed in the formula above) would then produce a
cumulative result as the obove formula does for the two criteria...getting
mixed up with my brackets etc
Cheers

 

[Jon Peltier]

Sometimes when I get stuck, I edit the formula in NotePad, and use lots of
lines, line breaks, and initial spaces to display the formula. I'll start
with the outermost part like this:

=SUM(
)

then I'll insert the next part:

=SUM(
IF(condition,
if_true,
if_false
)
)

and so on. When it all seems logical and correct, I remove the spaces and
line feeds, and paste it into the cell.

I've seen at least a couple of formula editors on various web sites (check
Dick Kusleika's blog, Daily Dose of Excel), but none have seemed easier to
me than NotePad.

- Jon

 

[Neil Pearce]

Perhpas you could use the conditional sum option under tools, you can input a
large number of confitions over and above 3?

 

[GD]

Well i've only got limited access to other websites as at work, but the
notepad suggestion has born some success...

=SUM(IF(MOD(ROW('2008 Errors'!$A$3:$A$3000),10)=3,IF((YEAR('2008
Errors'!$A$3:$A$3000)=2008)*(MONTH('2008 Errors'!$A$3:$A$3000)=1)*(LEN('2008
Errors'!P33000)-LEN(SUBSTITUTE('2008 Errors'!P33000,"Kirkby
Thore","")*(LEN('2008 Errors'!B3:B3000)-LEN(SUBSTITUTE('2008
Errors'!B3:B3000,"Fax",""))))>0),1)))

....however this now returns the result #VALUE! - which is a step forward
from earlier efforts just being reported as having an error in the formula!

 

[Jon Peltier]

You can also use the Evaluate Formula button on the Formula Auditing toolbar
to help figure out where a formula gets its results. You can have it
calculate a bit of the formula at a time, so you can see where you've made
an error.

- Jon