hotel.hlp

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{smcl}
{* 04apr2005}{...}
{cmd:help hotelling}{right:dialog:  {bf:{dialog hotelling}}}
{hline}

{title:Title}

{p2colset 5 23 25 2}{...}
{p2col :{bf:[MV] hotelling} {hline 2}}Hotelling's T-squared generalized means
test{p_end}
{p2colreset}{...}


{title:Syntax}

{p 8 15 2}{cmd:hotelling} {varlist} {ifin} {weight} [{cmd:,} 
{opth by(varname)} {opt not:able}]

{pstd}
{cmd:aweight}s and {cmd:fweight}s are allowed; see help {help weights}.

{pstd}
Note: {cmd:hotel} is a synonym for {cmd:hotelling}.


{title:Description}

{pstd}
{cmd:hotelling} performs Hotelling's T-squared test of whether a set of means
is zero or, alternatively, equal between two groups.


{title:Options}

{dlgtab:Model}

{phang}{cmd:by(}{it:varname}{cmd:)} specifies a variable identifying two
groups; a test of equality of means between groups is performed.  If
{cmd:by()} is not specified, a test of means being jointly zero is performed.

{phang}{cmd:notable} suppresses printing a table of the means being compared.


{title:Examples}

{phang}{cmd:. webuse gasexp}{p_end}
{phang}{cmd:. gen diff1 = ampg1 - bmpg1}{p_end}
{phang}{cmd:. gen diff2 = ampg2 - bmpg2}{p_end}
{phang}{cmd:. hotelling diff1 diff2}{p_end}

{phang}{cmd:. webuse gasexp2}{p_end}
{phang}{cmd:. hotelling mpg1 mpg2, by(additive)}{p_end}


{title:Also see}

{psee}
Manual:  {bf:[MV] hotelling}

{psee}
Online:  {helpb manova}, {helpb regress}, {helpb ttest}
{p_end}