Fitting Lifetime Data to a Weibull Model


	This Demonstration shows how to analyze lifetime test data from data-fitting to a Weibull distribution function plot. The data fit is on a log-log plot by a least squares fitting method. The results are presented as Weibull distribution CDF and PDF plots.


	Contributed by: Frederick Wu

The top-left table shows initial test data:

is lifetime.

is a simplified percentile as median rank.

The top-right graphic shows the data fit on a log-log plot with a least squares fitting method.

The bottom-left and bottom-right graphics show the lifetime result on a CDF and PDF of a Weibull distribution plot.

Reliability analysis (or survival analysis) is a branch of statistics that deals with death in biological organisms and failure in mechanical or electronics systems, which may be within a localized test time. This topic is called reliability theory or reliability analysis in engineering, and duration analysis or duration modeling in economics or sociology.

For more information on survival analysis, see the Wikipedia entry.