{smcl}
{* *! version 1.0.1 28oct2021 Matteo Bottai}{...}

{cmd:help m_effectsize}
{hline}

{hi:m_effectsize}: Cohen's D statistics for random effects models

{title:Syntax}

{p 8 13 2}
{cmd:m_effectsize {it:{help varname}} [, iqr options]}

{title:Description}

{pstd}
{cmd:m_effectsize} is a post-estimation command of xtreg ({manhelp xtreg XT:xtreg}) to estimate Cohen's D statistics for random effects models. It estimates the Cohen's D effect of the variable specified in {it:varname}.

{title:Options}

{synoptset 12 tabbed}{...}
{synopt:iqr}the effect size is relative to the interquartile range{p_end}
{synopt:options}specifies options as for the bootstrap command ({manhelp bootstrap R:bootstrap}){p_end}

{title:Examples}

{phang}// Use data{p_end}
{phang}{stata "use http://www.stata-press.com/data/r15/pig, clear"}{p_end}
{phang}{stata "gen treatment = mod(id,2)"}{p_end}
{phang}{stata "gen interaction =  treatment*week"}{p_end}

{phang}// Estimate a random effects model{p_end}
{phang}{stata "xtreg weight treatment week interaction, i(id)"}{p_end}

{phang}// Cluster bootstrap for Cohen's D{p_end}
{phang}{stata "m_effectsize interaction"}{p_end}

{title:Also see}

{phang}{manhelp xtreg XT:xtreg}, {manhelp bootstrap R:bootstrap}{p_end}

{title:Author}

{pstd}Matteo Bottai{p_end}
{pstd}Unit of Biostatistics{p_end}
{pstd}{browse "http://ki.se/":Institute of Environmental Medicine, Karolinska Institutet}{p_end}
{pstd}Stockholm, Sweden{p_end}