{smcl}
{* 10sep2008}{...}
{hi:help denscomp}
{hline}

{title:Title}

    {hi:denscomp {hline 2} Comparing density estimates in one graph}


{title:Syntax}

{p 8 18 2}{cmd:denscomp} [{varlist}]
{ifin}{cmd:,} {opth by(varname1)} {opth at(varname2)}
[{it:{help twoway_options}}]


{title:Description}

{p 4 4 2}
{cmd:denscomp} uses {helpb kdensity} to estimite densities of {it:varname}
for categories of {cmd:by()}. 


{title:Options}

{p 4 8 2}{opt by(varname1)} is required and is used to separate density
estimation for each category of {it:varname1}. 

{p 4 8 2}{opt at(varname2)} is required and specifies a variable that contains
the values at which the density should be estimated.  This option allows you
to more easily obtain density estimates for different variables or different
subsamples of a variable and then overlay the estimated densities for
comparison.  {cmd:at()} is the same for {cmd:denscomp} as it is for 
{cmd:kdensity}; see {manhelp kdensity R}.


{title:Example}

{phang}
{cmd:. denscomp linc, by(edu) at(xhelp)}


{title:Also see}

{psee}
    Manual:  {hi:[R] kdensity}

{psee}
Online:  {manhelp kdensity R}
{p_end}