PROC RELIABILITY: DISTRIBUTION Statement

The RELIABILITY Procedure

DISTRIBUTION Statement

DISTRIBUTION probability distribution-name ;

The ANALYZE, PROBPLOT, RELATIONPLOT, and MODEL statements require you to specify the probability distribution that describes your data. You can specify a probability distribution by using the DISTRIBUTION statement anywhere after the PROC RELIABILITY statement and before the RUN statement. If you do not specify a distribution in a DISTRIBUTION statement, the normal distribution is assumed. The probability distribution specified determines the distribution for which parameters are estimated from your data. The valid distributions and the statements to which they apply are shown in Table 12.6.

Table 12.6 Probability Distributions
Distribution	Distribution-Name Specified	Statement
binomial	BINOMIAL	ANALYZE
exponential	EXPONENTIAL	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL
extreme value	EXTREME \| EV	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL
generalized gamma	GAMMA	MODEL
logistic	LOGISTIC \| LOGIT	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL
loglogistic	LLOGISTIC \| LLOGIT	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL
lognormal (base $\text{[math]}$ )	LOGNORMAL \| LNORM	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL
lognormal (base 10)	LOGNORMAL10 \| LNORM10	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL
normal	NORMAL	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL
Poisson	POISSON	ANALYZE
Weibull	WEIBULL	ANALYZE, PROBPLOT,
		RELATIONPLOT, MODEL

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