Probability plot for data compared with fitted beta distribution ----------------------------------------------------------------
^pbeta4^ varname [^if^ exp] [^in^ range] [ ^,^ ^a^lpha^(^#^)^ ^b^eta^(^#^) > ^ ^gr^id graph_options ]
Description -----------
^pbeta4^ produces a probability plot for varname compared with a two-parameter beta distribution with shape parameters alpha and beta. By default, alpha and beta are taken from S_2 and S_3, which is where ^beta4^ puts maximum likelihood estimates of them.
Note: this is the original version of ^pbeta^, written for Stata 4. Users of Stata 8 up should switch to ^pbeta^.
Options -------
^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 -------
. ^beta4 hail^ . ^pbeta4 hail^
Author ------ Nicholas J. Cox, University of Durham, U.K. n.j.cox@@durham.ac.uk
Also see --------
On-line: help for @graph@, @beta4@ (if installed), @qbeta4@ (if installed)