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help for ^pgamma4^
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Probability plot for data compared with fitted gamma distribution
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    ^pgamma4^ varname [^if^ exp] [^in^ range] [ ^,^ ^a^lpha^(^#^)^  ^b^eta^(^#^)^ ^gr^id
    graph_options ]

Description
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^pgamma4^ produces a probability plot for varname compared with a
two-parameter gamma distribution with shape parameter alpha and scale
parameter beta. By default, alpha and beta are taken from S_alpha and
S_beta, which is where ^gamma4^ puts maximum likelihood estimates of
them.

Note: this is the original version of ^pgamma^, written for Stata 4. 
Users of Stata 8 up should switch to ^pgamma^. 

Options
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^alpha(^#^)^ sets alpha to #.

^beta(^#^)^ sets beta to #.

^grid^ is equivalent to ^yline(.25,.5,.75) xline(.25,.5,.75)^.

graph_options are any of the options allowed with ^graph, twoway^; see
    help for ^graph^.

Example
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        . ^gamma4 precip^
        . ^pgamma4 precip^

Author
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         Nicholas J. Cox, University of Durham, U.K.
         n.j.cox@@durham.ac.uk

Also see
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On-line: help for @graph@, @gamma4@, @qgamma4@