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help for ^psm^                                      (STB-48: gr35)
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Probability plot for data compared with fitted Singh-Maddala distribution
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    ^psm^ varname [^if^ exp] [^in^ range] [ ^,^ ^gr^id graph_options ]


Description
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^psm^ produces a probability plot for varname compared with a
three-parameter Singh-Maddala distribution. The parameters a, b and q
are taken from S_a, S_b and S_q, which is where ^smfit^ puts maximum
likelihood estimates of them.


Options
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^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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        . ^smfit income^
        . ^psm income^


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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    STB: STB-48 gr35
On-line: help for @graph@, @smfit@, @qsm@