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help for ^qbeta4^
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Quantile-quantile plot for data vs fitted beta distribution
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^qbeta4^ varname [^if^ exp] [^in^ range]
[ ^,^ ^a^lpha^(^#^)^ ^b^eta^(^#^)^ ^gr^id graph_options ]
Description
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^qbeta4^ plots the quantiles of varname against the quantiles of 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 ^qbeta^, written for Stata 4.
Users of Stata 8 up should switch to ^qbeta^.
Options
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^alpha(^#^)^ sets alpha to #.
^beta(^#^)^ sets beta to #.
^grid^ adds grid lines at the .05, .10, .25, .50, .75, .90, and .95
quantiles.
graph_options are any of the options allowed with ^graph, twoway^; see
help for ^graph^.
Examples
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. ^beta4 hail^
. ^qbeta4 hail^
Author
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Nicholas J. Cox, University of Durham, U.K.
n.j.cox@@durham.ac.uk
Acknowledgement
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Alan Feiveson pointed out that ^invfprob()^ could be used to
obtain the inverse of the beta distribution function.
Also see
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On-line: help for @graph@, @beta4@ (if installed), @pbeta4@ (if installed)