_get_offopt.hlp

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{smcl}
{* 10mar2005}{...}
{cmd:help _get_offopt}{...}
{right:also see:  {help undocumented}}
{hline}

{title:Title}

{pstd}
{hi:_get_offopt} {hline 2}
Parsing tool for getting offset option specification


{title:Syntax}

{pstd}
Standard offset variable syntax:

{phang2}
{cmd:_get_offopt} [{it:varname}]


{pstd}
Exposure variable syntax (also known as log offset):

{phang2}
{cmd:_get_offopt} [{opt ln(varname)}]


{title:Description}

{pstd}
{cmd:_get_offopt} is a programming tool that helps identify which option was
used to specify an offset in an estimation command, based on what is typically
put in {cmd:e(offset)}.  Basically, {cmd:_get_offopt} looks at the supplied
argument and returns the associated option in {cmd:s(offopt)},
{it:varname} is returned in {cmd:s(offvar)}.


{title:Examples}

    {cmd}. sysuse auto, clear
    {txt}(1978 Automobile Data)

    {cmd}. quietly poisson mpg turn trunk, exposure(gear)
    {txt}
    {cmd}. di "`e(offset)'"
    {res}ln(gear_ratio)
    {txt}
    {cmd}. _get_offopt `e(offset)'
    {txt}
    {cmd}. sreturn list

    {txt}macros:
                s(offvar) : "{res}gear_ratio{txt}"
                s(offopt) : "{res}exposure(gear_ratio){txt}"


{title:Also see}

{psee}
Online:  
{helpb syntax}
{p_end}