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Calculate percentage summary field - using only a specific value

Question asked by joelande on Oct 7, 2011
Latest reply on Oct 7, 2011 by joelande

Title

Calculate percentage summary field - using only a specific value

Post

I have a database looking at student test scores.

There is a record for each student test.

I have a layout that is using three sub-summary layout parts:

a) teacher name

b) pass

c) achievement

 

Pass can either be "pass" or fail"

I have a summary field called "count" that sums the student ID, and have it on each sub-summary layout, so it reports each sub-category of performance.

I want to calculate the PERCENTAGE of students who PASSED for each teacher.

 

I created a calculation field "performance_value" that looks like this:

Round ( GetSummary ( count ; Pass )/GetSummary ( count ; Teacher ) ; 3 )*100

 

This works for most cases, because I sort the pass field by a value list definition, placing "pass" at the top.

However, if a teacher doesn't have ANY students that pass, it incorrectly states that the teacher had 100% pass, because it is grabbing the first summary value that it finds, and in this case it represents the number of students who failed.

 

So how can I more accurately/specificaly calculate the value showing percent of students that passed?

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