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PPPLOT Statement |
You can use the PPPLOT statement to request P-P plots based on the theoretical distributions summarized in the following table:
Table 8.12: Distributions and ParametersParameters | |||||
Family | Distribution Function F(x) | Range | Location | Scale | Shape |
Beta | , | ||||
Exponential | |||||
Gamma | |||||
Lognormal | |||||
Normal | all x | ||||
Weibull | c | ||||
You can request these distributions with the BETA, EXPONENTIAL, GAMMA, LOGNORMAL, NORMAL, and WEIBULL options, respectively. If you do not specify a distribution option, a normal P-P plot is created.
To create a P-P plot, you must provide all of the parameters for the theoretical distribution. If you do not specify parameters, then default values or estimates are substituted, as summarized by the following table:
Table 8.13: Defaults for ParametersFamily | Default Values | Estimated Values |
Beta | , | maximum likelihood estimates for and |
Exponential | maximum likelihood estimate for | |
Gamma | maximum likelihood estimates for and | |
Lognormal | maximum likelihood estimates for and | |
Normal | None | sample estimates for and |
Weibull | maximum likelihood estimates for and c |
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