{smcl}
{* 23oct2004}{...}
{hline}
help for {hi:semean}
{hline}

{title:Calculate standard error of mean, optionally applying function}

{p 8 17}{cmd:semean}
{it:varname}
[{cmd:if} {it:exp}]
[{cmd:in} {it:range}] 
[{cmd:,} {cmdab:nop:rint}
{cmdab:func:tion(}{it:string}{cmd:)}
]


{p 4 4}{cmd:varname} may contain time-series operators; see help {cmd:varlist}. {p_end}

{p 4 4}{cmd:semean} calculates the standard error of the mean of a variable.
Optionally, a function of the variable may be applied prior to computation of
the variable's statistics.{p_end}

{p 4 4}This command was written as an illustration of ado-file development for
Baum (2006). An {cmd:egen} function to compute the standard error of the mean
is available in Nicholas Cox's {cmd:egenmore} package.

{title:Options}
    
{p 4 8}{cmdab:func:tion(}{it:string}{cmd:)} may be given in order to calculate
statistics based on that transformation of the variable. Any valid Stata numeric
function may be provided.

{p 4 8}{cmdab:nop:rint} specifies that no output is to be produced. With or
without this option, the mean, standard error of mean and number of valid observations
are placed in the return vector.


{title:Examples}

{p 4 8}{stata "webuse lutkepohl,clear" :. webuse lutkepohl,clear}{p_end}

{p 4 8}{stata "semean investment" :. semean investment}{p_end}

{p 4 8}{stata "semean linvestment" :. semean linvestment}{p_end}

{p 4 8}{stata "semean investment, func(log)" :. semean investment, func(log)}{p_end}

{title:Author}

{p 4 4}Christopher F. Baum, Boston College, USA{break} 
       baum@bc.edu
       

{title:References}

{p}Christopher F Baum, 2006. An Introduction to Modern Econometrics with Stata.
College Station:Stata Press.{p_end}


{title:Also see}

{p 4 13}On-line: {help egenmore} (if installed){p_end}