SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: John
Date posted: Wed Jun 13 10:04:56 US/Eastern 2001
Subject: Data Analysis
Has anyone tried to apply the Non-homogenous Poisson methods for multiple units with different start and stop times? Can this be done in MS Excel. How do you solve for lamda and beta? Thank you, Any help would be appreciated
Subject: NHP and npmle of reliability and failure rate functions
Reply Posted by: Larry George
Organization: Problem Solving Tools
Date Posted: Thu Jun 14 17:41:44 US/Eastern 2001
Failures of products shipped at different times may be regarded as the output from nonhomogeneous Poisson processes.
Please refer to http://web.utk.edu/~asaqp/newsletters/1299newsletter.pdf page 13 for the nonparametric max likelihood estimates of reliability and failure rate functions from multiple units with different start and stop times, singly or grouped.
Http://members.home.net/pstlarry/ProdRel.htm gives software specification. I'm working on an interactive version in VBScript.
Generally accepted accounting principles require population ships and returns (failure) data, grouped by accounting interval. Such data are sufficient to estimate npmle reliability, for products. Given BoMs, you can estimate service part reliability too. Send data and I will send back free samples, or enter data into http://members.home.net/pstlarry/Table.htm.