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help for ^npshift^                                                [STB-52: sg123]
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Hodges-Lehmann estimates of shift parameters
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 ^npshift^  varname   [^if^ exp] [^in^ range]^,^ ^by(^groupvar^)^ [level (#)]


Description
-----------

^npshift^ is a non-parametric procedure that extends the Wilcoxon-Mann-Whitney 
test to the problem of estimating the shift parameter between two populations.
^npshift^ computes both a point estimate and a confidence interval for the shift
parameter.


Options
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^level(#)^ specifies the confidence level, in percent, for confidence
intervals. The default is level(95) or as set by set level.

^by(^groupvar^)^ is not optional.  It specifies the name of the grouping variable.


Examples
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	. ^npshift mpg, by(treat)^
	. ^npshift mpg, by(treat) level(90)^


Author
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       Duolao Wang
       London School of Hygiene and Tropical Medicine, UK
       email: d.wang@@lshtm.ac.uk