# How to workout the error rate or percentage of a spreadsheet using a specific value as reference?

#### Sampoline

##### New Member
I want to be able to calculate the rate/percentage of error. I have 3 sheets: Master, Co-Master and ReDo.

Both the Master and Co-Master sheets have a total time column (J) to give the total time a user has taken to complete a task. The ReDo sheet is solely to record issues with the Master or Co-Master. So if an entry in either sheet needs to be assessed and fixed for an issue, then the total time column in the ReDo sheet is filled.

Now the ReDo sheet has another column (E) that is data validated as a list, with options: 'Master' and 'Co-Master' referenced. So when I select "Master" and then fill out my total time, that will count as an error in the Master and vice versa with Co-Master.

Essentially I want my formula(s) to give me:

If the 'ReDo' sheet column E has Master selected then count the number of cells in column J that have a value in them and divide it by the same in sheet 'Master'

I tried the following formula:

Excel Formula:
``=IF(ReDo!E3:E100000="Master",COUNTIF(ReDo!J3:J100000,"?*")/SUMPRODUCT((Master!J2:J100000<>"")+0),"")``

But was met with a #VALUE error. Any ideas?

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#### Eric W

##### MrExcel MVP

=SUMPRODUCT(--(Redo!E3:E100000="Master"),--(Redo!J3:J100000<>""))/SUMPRODUCT(--(Master!J2:J100000<>""))

#### Sampoline

##### New Member

=SUMPRODUCT(--(Redo!E3:E100000="Master"),--(Redo!J3:J100000<>""))/SUMPRODUCT(--(Master!J2:J100000<>""))
Thankyou Eric, this works perfectly!

#### Eric W

##### MrExcel MVP
Happy to help! Thanks for the feedback.

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