Introduction

The reliability procedure estimates the parameters of the exponential, extreme value, logistic, log-logistic, lognormal, normal, and Weibull probability distributions by maximum likelihood and least squares. It can fit complete, right censored, left censored, interval censored (readout), and grouped data values. It also computes the nonparametric Kaplan-Meier and Nelson-Aalen estimates of reliability and associated hazard rates.

Another module fits the regression relationship between time-to-failure and one or more independent variables. The distribution of the residuals (errors) can follow the exponential, extreme value, logistic, log-logistic, lognormal, lognormal10, normal, or Weibull distributions. The data may include failed, left censored, right censored, and interval observations. This type of data often arises in the area of accelerated life testing.

Features