PRISM Forum - Message Replies

Topic: PRISM Questions and Answers
Topic Posted by: SRC ( )
Organization: SRC
Date Posted: Wed Jan 12 8:33:33 US/Eastern 2000
Topic Description: Welcome to the PRISM forum! Please feel free to post your questions and comments about the PRISM assessment software here.

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Original Message:

Posted by: Ananda Perera ( )
Date posted: Sun Jan 30 16:45:24 US/Eastern 2000
Subject: Infant Mortality (IM) Pi Factor
Reference RAC Journal, Third Quarter-1999 Page 4 Pi_IM Equation: (1) When SS=0.5; Pi_IM(Instantaneous at 5 Year) = 0.7662 and Pi_IM (Average over 5 Years) = 0.4728. (2) When SS=0.9; Pi_IM(Instantaneous at 5 Year) = 1.3792 and Pi_IM (Average over 5 Years) = 0.8512. Why does Pi_IM Factor increase when Screening Strength (SS)was increased. High Screening Strength is supposed to give lower failure rate. Thanks.


Subject: Infant Mortality (IM) Pi Factor
Reply Posted by: Norman B. Fuqua ( )
Organization: RAC
Date Posted: Thu Feb 3 7:44:26 US/Eastern 2000
You are correct in your analysis. Unfortunately there was a typographical error in the equation as it was published. It should have read 1- the entire quantity to the right of the equal sign.

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