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How to use Cognos report studio to change default Total() calculation

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kristo5747

Programmer
Mar 16, 2011
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Hello!

I have a crosstab report that calculates for failure rates for my products ; it has two measures (PASSCOUNT, FAILCOUNT) and a calculation FAILRATE (FAILCOUNT/PASSCOUNT+FAILCOUNT)

The report layout looks thusly:
OEM
MODEL
TESTYEAR TESTMONTH PASSCOUNT FAILCOUNT FAILRATE

When I select the Total icon, it logically adds up each of the columns like so
2012 OCT 7547 697 0.08
NOV 9570 373 0.04
DEC 1879 107 0.05
------------------------
Total 18996 1177 0.17

My user however wants TOTAL FAILRATE to be
TOTAL FAILCOUNT/(TOTAL PASSCOUNT+TOTAL FAILCOUNT)

which translates to
1177 / (18996+1177) = 0.058

How can I create this custom total in the report? I am reading about creating a Query calculation but I am not clear this is the right approach.

Cognos Report Studio 8.4 IBM DB2 UDB
 
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