3P-Weibull Rank Regression

This example validates the calculations for 3-parameter Weibull with rank regression in Weibull++ standard folios.

Table 6.3 on page 292 in the book Reliability Engineering Handbook Vol 1 by Dr. Kececioglu, Prentice-Hall, 1991.

In the book, the results are obtained by visually fitting a straight line to the median rank at each failure point. The reliability function for a 3P-Weibull distribution is:


 * $$R(t)=e^{-\left({\frac{t-\gamma }{\eta}}\right )^{\beta }}\,\!$$

The results are $${\beta}\,\!$$ = 1.2, $${\eta}\,\!$$ = 144 and $${\gamma}\,\!$$ = 30