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: Jim Weber
Date posted: Wed Apr 27 11:57:30 US/Eastern 2005
Subject: Question about Instantaneous Failure Time
Could you please explain the meaning of the "Instantaneous Failure Time" factor which can be changed for the Infant Mortality Process Grade? The manual says: "the time when all infant mortality failures have been removed from the system". I understand it that way, that the shorter the "Instantaneous Failure Time" the better the Infant Mortality Process Grade is supposed to be, as (corresponding to the manual) it takes less time to remove infant mortality failures from the system. But in fact the opposite seems to apply. Best Regards, J.W.


Subject: Instantaneous Failure Time
Reply Posted by: Norman B. Fuqua ( )
Organization: RAC
Date Posted: Tue May 3 13:22:50 US/Eastern 2005
In researching your question I discovered that the formula for the instantaneous failure rate as recorded in Appendix I of the PRISM Users manual is incorrect. It should be: (1-SSESS)x (t exp -.62/1.77) The Appendix I will be changed to reflect the correct formula.

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