Subject: | |
From: | |
Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 23 Sep 1999 10:39:56 EDT |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
Hi Yuan,
The sample size recommended is a minimum of 32 to assure adequate statistical
robustness; unfortunately, many industry test programs utilize a smaller
number to reduce costs.
While a lognormal distribution can be fitted to the data, a better fit is
typically achieved with a Weibull distribution; the Weibull distribution is
used now almost exclusively.
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com
##############################################################
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 Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################
|
|
|