unab.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}
{* 10feb2005}{...}
{cmd:help unab}, {cmd:help tsunab}
{hline}

{title:Title}

{p2colset 5 17 19 2}{...}
{p2col :{hi:[P] unab} {hline 2}}Unabbreviate variable list{p_end}
{p2colreset}{...}


{title:Syntax}

{pstd}
Standard variable lists

{p 8 13 2}{cmd:unab} {it:lmacname} {cmd::} [{varlist}] [{cmd:,}
	{cmd:min(}{it:#}{cmd:)} {cmd:max(}{it:#}{cmd:)}
	{cmd:name(}{it:string}{cmd:)}]


{pstd}
Variable lists that may contain time-series operators

{p 8 15 2}{cmd:tsunab} {it:lmacname} {cmd::} [{varlist}] [{cmd:,}
	{cmd:min(}{it:#}{cmd:)} {cmd:max(}{it:#}{cmd:)}
	{cmd:name(}{it:string}{cmd:)}]


{title:Description}

{pstd}
{cmd:unab} expands and unabbreviates a {varlist} of existing variables,
placing the results in the local macro {it:lmacname}.  {cmd:unab} is a
low-level parsing command.  The {cmd:syntax} command is a high-level parsing
command that, among other things, also unabbreviates variable lists; see
{helpb syntax}.

{pstd}
The difference between {cmd:unab} and {cmd:tsunab} is that {cmd:tsunab}
allows time-series operators to modify the variables in {varlist}.


{title:Options}

{phang}{cmd:min(}{it:#}{cmd:)} specifies the minimum number of variables
allowed.  The default is {hi:min(1)}.

{phang}{cmd:max(}{it:#}{cmd:)} specifies the maximum number of variables
allowed.  The default is {hi:max(32000)}.

{phang}{cmd:name(}{it:string}{cmd:)} provides a label that is used when
printing error messages.


{title:Examples}

{pstd}
Within a program that did the high-level command parsing using
{helpb syntax}, as in

{phang2}{cmd:syntax varname [if] [in], BY(string)} {it:...}

{pstd}
Further low-level parsing might be needed.  For instance,

	{cmd:capture confirm var `by'}
	{cmd:if _rc == 0 {c -(}}
		{cmd:unab by : `by', max(1) name(by())}
	{cmd:{c )-}}
	{cmd:else {c -(}}
		{it:...} {txt}something else is done with {cmd:`by'} {it:...}
	{cmd:{c )-}}

{pstd}
Within a program that allows time-series variable lists, you might have

	{cmd:tsunab myvar : `myvar'}

{pstd}
The local macro {hi:myvar} would then contain the unabbreviated variable
list with time-series operators (if any) in standard form.


{title:Also see}

{psee}
Manual:  {bf:[P] unab}

{psee}
Online:  {helpb syntax}, {helpb time}, {helpb tsrevar}, {helpb unabcmd}
{p_end}