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: Travis Todd
Organization:Vanderbilt University
Date posted: Tue May 21 11:39:31 US/Eastern 2002
Subject: what is it based on?
What are the underlying techniques and mathematical models that PRISM is based on? What methods are used to come up with a reliability prediction? I've seen Bayesian techniques mentioned quite a bit. What is PRISM built on? Help me out!


Subject: PRISM Models
Reply Posted by: Norman B. Fuqua ( )
Organization: RAC
Date Posted: Thu May 23 10:50:16 US/Eastern 2002
There are two basic models involved: a Part Model of which there are some 50+ variations and a systems model which then becomes a multiplier for the various parts models. The basic part model is a relatively simple additive model the various parameters having been established by regression analyses of field usage and other data contained in the RAC database. PRISM has the capability of doing a Bayesian analysis but this is more of an enhancement capability than a basic model. For additional information please see the PRISM tutorial that was published in the 2001 annual R&M Symposium Tutorial Notes. I trust that it will answer most of your questions.

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