qby.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}
{* 07dec2004}{...}
{cmd:help qby} {right:also see:  {help undocumented}}
{hline}

{title:Title}

{p2colset 5 12 14 2}{...}
{p2col :{hi:qby} {hline 2}}Quietly repeat Stata command on subsets of the
data{p_end}


{title:Syntax}

{p 8 34 2}{cmd:qby} {it:varlist}{cmd::}  {it:command}

{p 8 34 2}{cmd:qby} {it:varlist1} [{cmd:(}{it:varlist2}{cmd:)}]
	[{cmd:,} {cmdab:s:ort} {cmd:rc0}]{cmd::}  {it:command}


{p 8 34 2}{cmd:qbys} {it:varlist}{cmd::}  {it:command}

{p 8 34 2}{cmd:qbys} {it:varlist1} [{cmd:(}{it:varlist2}{cmd:)}]
	[{cmd:,} {cmd:rc0}]{cmd::}  {it:command}


{title:Description}

{pstd}
{cmd:qby} and {cmd:qbys} are convenience commands and are equivalent to

	    {cmd:quietly by} {it:...}
    and
	    {cmd:quietly bysort} {it:...}

{pstd}
See {helpb by} and {helpb quietly}.


{title:Also see}

{psee}
Online:  help for
{helpb by},
{help byprog},
{helpb quietly}
{p_end}