Quality and Reliability Methods - SAS

Chapter 13 Lifetime Distribution 215
The Life Distribution Report Window
Figure 13.6 Censored Data Types
right censored (rows
three and four)
left censored (rows
one and two)
interval censored
(rows five and six)
Compare Distributions Report
The Compare Distributions report lets you fit different distributions to the data and compare the fits. The
default plot contains the nonparametric estimates (Kaplan-Meier-Turnbull) with their confidence intervals.
When you select a distribution method, the following events occur:
• The distributions are fit and a Parametric Estimate report appears. See “Parametric Estimate” on
page 217.
• The cumulative distribution estimates appear on the probability plot (in Figure 13.7, the magenta and
yellow lines).
• The nonparametric estimates (or horizontal blue lines) also appear initially (unless all data is right
censored). For right-censored data, the plot shows no nonparametric estimates.
• The shaded regions indicate confidence intervals for the cumulative distributions.
• A profiler for each distribution shows the cumulative probability of failure for a given period of time.
Figure 13.7 shows an example of the Compare Distributions report.