Ken, There is a great program out called "statgraphics" it has a module which is called "forecasting" and it will, given a set of variables, do a pretty fair job of determining anticipated failure rates. It also has every type of graphing function you may want. Regards, Alan B. Cochrane Ken Patel wrote: > > Reliability/Quality Guru, > I received this question from our engineering department. > > Currently, they are seeing 1 system crash out of 10 times. They want to > improve the crash rate to 1 failure every 30 times with 90% confidence > level. They want to know how many operation "X" they will run with no more > than "Y" failures with 90% confidence level which will yield 1 failure every > 30 times. > > I do not know how to solve it as haven't practiced it. Am I providing enough > information or what information is needed to make a sense out of it? What > kind of model it will fit, Poisson, Binomial, etc? > > Any help will be highly appreciated. > > re, > ken patel > > ______________________________________________________ > Ken Patel Phone: (408) 490-6804 > 1708 McCarthy Blvd. Fax: (408) 490-6859 > Milpitas, CA 95035 Beeper: (888) 769-1808 > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################