Excel's Formula - sisman

Chapter 7: Counting and Summing Techniques 187
Counting logical values
The following array formula returns the number of logical values (TRUE or FALSE) in a range
named Data:
{=SUM(IF(ISLOGICAL(Data),1))}
Counting error values in a range
Excel has three functions that help you determine whether a cell contains an error value:
ISERROR: Returns TRUE if the cell contains any error value (#N/A, #VALUE!, #REF!,
#DIV/0!, #NUM!, #NAME?, or #NULL!)
ISERR: Returns TRUE if the cell contains any error value except #N/A
ISNA: Returns TRUE if the cell contains the #N/A error value
Notice that the #N/A error value is treated separately. In most cases, #N/A is not a
“real” error. #N/A is often used as a placeholder for missing data. You can enter the
#N/A error value directly or use the NA function:
=NA()
You can use these functions in an array formula to count the number of error values in a range.
The following array formula, for example, returns the total number of error values in a range
named Data:
{=SUM(IF(ISERROR(Data),1))}
Depending on your needs, you can use the ISERR or ISNA function in place of ISERROR.
If you would like to count specific types of errors, you can use the COUNTIF function. The following
formula, for example, returns the number of #DIV/0! error values in the range named Data:
=COUNTIF(Data,”#DIV/0!”)
Advanced Counting Formulas
Most of the basic examples I presented previously use functions or formulas that perform conditional
counting. The advanced counting formulas that I present here represent more complex
examples for counting worksheet cells, based on various types of selection criteria.