Good afternoon,
I am trying to calculate an average over multiple fields. I've tried using the following
=Avg(IIF([Score A] = "NA",Null, Val([Score A]))) + Avg(IIF([Score B] = "NA",Null, Val([Score B]))) + Avg(IIF([Score C] = "NA",Null, Val([Score C])))
The above, [Score A], [Score B], etc. are text fields pertaining to an evaluation rating scale:
NA 1 2 3 4 5
I would like to calculate an average over all the evaluation questions. The AVG formula ignores Null Values which is why i am trying to get the expression to set the value to NULL when NA is entered, meaning that the question does not apply and therefore it will not be included in the AVG calculation. I use VAL because of the fact that i have the field set to text.
Please help, i am not able to find a solution to this problem.
Thanks in advance for your efforts and help.
My operating system is XP and this is for Access 2003.
Rene
2  6376  
Good afternoon,
I am trying to calculate an average over multiple fields. I've tried using the following
=Avg(IIF([Score A] = "NA",Null, Val([Score A]))) + Avg(IIF([Score B] = "NA",Null, Val([Score B]))) + Avg(IIF([Score C] = "NA",Null, Val([Score C])))
The above, [Score A], [Score B], etc. are text fields pertaining to an evaluation rating scale:
NA 1 2 3 4 5
I would like to calculate an average over all the evaluation questions. The AVG formula ignores Null Values which is why i am trying to get the expression to set the value to NULL when NA is entered, meaning that the question does not apply and therefore it will not be included in the AVG calculation. I use VAL because of the fact that i have the field set to text.
Please help, i am not able to find a solution to this problem.
Thanks in advance for your efforts and help.
My operating system is XP and this is for Access 2003.
Rene
Try this and see if it helps:
=Avg(IIF([Score A] = "NA","", Val(Nz([Score A],"")))) + Avg(IIF([Score B] = "NA","", Val(Nz([Score B],"")))) + Avg(IIF([Score C] = "NA","", Val(Nz([Score C],""))))
 ADezii 8,834
Recognized Expert Expert
Good afternoon,
I am trying to calculate an average over multiple fields. I've tried using the following
=Avg(IIF([Score A] = "NA",Null, Val([Score A]))) + Avg(IIF([Score B] = "NA",Null, Val([Score B]))) + Avg(IIF([Score C] = "NA",Null, Val([Score C])))
The above, [Score A], [Score B], etc. are text fields pertaining to an evaluation rating scale:
NA 1 2 3 4 5
I would like to calculate an average over all the evaluation questions. The AVG formula ignores Null Values which is why i am trying to get the expression to set the value to NULL when NA is entered, meaning that the question does not apply and therefore it will not be included in the AVG calculation. I use VAL because of the fact that i have the field set to text.
Please help, i am not able to find a solution to this problem.
Thanks in advance for your efforts and help.
My operating system is XP and this is for Access 2003.
Rene
Anytime that you are using the IIf() Function in conjunction with possible NULL values, you are literally playing with fire because of the inefficiency of IIf() and the usual NULL problems.
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