Quality and Reliability Methods - SAS

Chapter 20 Reliability and Survival Analysis II 383
Options and Reports
Hours is the failure or censoring time. The lognormal distribution is fit to the distribution of this time. To
do so, select Analyze > Reliability and Survival > Fit Parametric Survival. Assign Hours to Time to
Event, x as a model effect, Censor to Censor and Weight to Freq. Also, change the Distribution type to
Lognormal.
After clicking Run, the result shows the regression fit of the data. If there is only one regressor and it is
continuous, then a plot of the survival as a function of the regressor is shown. Lines are at 0.1, 0.5, and 0.9
survival probabilities. If the regressor column has a formula in terms of one other column, as in this case, the
plot is done with respect to the inner column. In this case the regressor was the column x, but the plot is
done with respect to Temp, of which x is a function.
Figure 20.11 Devalt Parametric Output