svy_heckprob.hlp

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{smcl}
{* 29mar2005}{...}
{cmd:help svy: heckprob}{...}
{right:dialogs:  {bf:{dialog svy_heckprob}}{space 16}}
{right:also see:  {help "svy: heckprob postestimation"}}
{hline}

{title:Title}

{p2colset 5 28 30 2}{...}
{synopt :{hi:[SVY] svy: heckprob} {hline 2}}Probit
regression with selection for survey data{p_end}
{p2colreset}{...}


{title:Syntax}

{pstd}
Basic syntax

{phang2}
{cmd:svy}{cmd::} {cmd:heckprob} {depvar} [{indepvars}]
	{cmd:,} {opt sel:ect([depvar_s =] varlist_s)}


{pstd}
Full syntax

{p 8 12 1}
{cmd:svy} [{it:vcetype}] [{cmd:,} {it:svy_options}]
{cmd::} {cmd:heckprob} {depvar} [{indepvars}] {ifin}{cmd:,}
	{opt sel:ect}{cmd:(}[{it:depvar_s} =] {it:varlist_s}
		[{cmd:,}
			{opt off:set(varname)}
			{opt noc:onstant}
		]{cmd:)}
	{bind:[{it:options}]}


{synoptset 25 tabbed}{...}
INCLUDE help svy_optable


{synopthdr:options}
{synoptline}
{syntab:Model}
{p2coldent :* {opt sel:ect()}}specify
	selection equation dependent and independent variables; whether to
	have constant term and offset variable{p_end}
{synopt :{opt nocon:stant}}suppress the constant term{p_end}
{synopt :{opt off:set(varname)}}include
	{it:varname} in model with coefficient constrained to 1{p_end}
{synopt :{opt const:raints(constraints)}}apply
	specified linear constraints{p_end}

{syntab:Max options}
{synopt :{it:{help maximize:maximize_options}}}control
	the maximization process; seldom used{p_end}
{synoptline}
{pstd}
* {opt select()} is required.  The full specification is{p_end}
{pmore}
{opt sel:ect}{cmd:(}[{it:depvar_s} {cmd:=}] {it:varlist_s} [{cmd:,}
{opt off:set(varname)} {opt noc:onstant}]{cmd:)}
{p2colreset}{...}


{title:Description}

{pstd}
{cmd:svy: heckprob} fits probit models with selection for
complex survey data;
see {helpb heckprob} for a description of this model involving nonsurvey data,
and {helpb "svy: heckman"} for regression models with selection for complex
survey data.


{title:Options}

{phang}
{it:svy_options}; see {helpb svy}.

{dlgtab:Model}

{phang}
{opt select(...)} specifies the variables and options for the selection
equation.  It is an integral part of specifying a Heckman model and is
required.  The selection equation should contain at least one variable that is
not in the outcome equation.

{pmore}
If {it:depvar_s} is specified, it should be coded at 0 or 1, 0 indicating an
observation not slected and 1 indicating a slected observation.  If
{it:depvar_s} is not specified, observations for which {it:depvar} is not
missing are assumed to be selected, and those for which {it:depvar} is missing
are assumed to be not selected.

{phang}
{opt noconstant}, {opt offset(varname)}, {opt constraints(constraints)};
see {help estimation options}.

INCLUDE help svy_ml_maximize_options


{title:Example}

{phang}
{cmd:. webuse school}
{p_end}
{phang}
{cmd:. svyset _n}
{p_end}
{phang}
{cmd:. svy jackknife, nodots:}
{cmd:heckprob private years logptaz, select(vote = years loginc logptax)}
{p_end}


{title:Also see}

{psee}
Manual:  {bf:[SVY] svy: heckprob}

{psee}
Online:  {help "svy: heckprob postestimation"};{break}
{helpb heckprob},
{helpb "svy: heckman"},
{helpb "svy: probit"}
{p_end}