xtsum.hlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{smcl}
{* 22mar2005}{...}
{cmd:help xtsum}{right:dialog:  {bf:{dialog xtsum}}}
{hline}

{title:Title}

{p2colset 5 19 21 2}{...}
{p2col :{hi:[XT] xtsum} {hline 2}}Summarize xt data{p_end}
{p2colreset}{...}


{title:Syntax}

{p 8 14 2}{cmd:xtsum} [{varlist}] [{it:{help if}}] [{cmd:,}
    {opth "i(varname:varname_i)"}]


{phang}
{it:varlist} may contain time-series operators; see {help tsvarlist}.{p_end}
{phang}
{cmd:by} may be used with {cmd:xtsum}; see {helpb by}.{p_end}


{title:Description}

{pstd}
{cmd:xtsum}, a generalization of {helpb summarize}, reports means and
standard deviations for cross-sectional time-series (xt) data; it differs from
{cmd:summarize} in that it decomposes the standard deviation into between and
within components.


{title:Option}

{phang}
{opth "i(varname:varname_i)"} specifies the variable name that contains the
unit to which the observation belongs; see {help xt}.


{title:Example}

    {cmd:. iis patid}
    {cmd:. xtsum bp}


{title:Also see}

{psee}
Manual:  {bf:[XT] xtsum}

{psee}
Online:  {help xt}, {helpb xtdes}, {helpb xttab}
{p_end}