dcfcns.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}
{* 07apr2005}{...}
{cmd:help dcfcns}
{hline}

{title:Title}

{pstd}
{hi:[U] 24.3.4 Translating between time units}


{title:Remarks}

{pstd}Conversion to %d (%td) dates:{p_end}
{p 8 17 2}{it:...} {cmd:dofd(}{it:%td_daily_date_exp}{cmd:)} {it:...} {space 7} returns {cmd:%d} ({cmd:%td}) date{p_end}
{p 8 17 2}{it:...} {cmd:dofw(}{it:%tw_weekly_date_exp}{cmd:)} {it:...} {space 6} returns {cmd:%d} ({cmd:%td}) date{p_end}
{p 8 17 2}{it:...} {cmd:dofm(}{it:%tm_monthly_date_exp}{cmd:)} {it:...} {space 5} returns {cmd:%d} ({cmd:%td}) date{p_end}
{p 8 17 2}{it:...} {cmd:dofq(}{it:%tq_quarterly_date_exp}{cmd:)} {it:...} {space 3} returns {cmd:%d} ({cmd:%td}) date{p_end}
{p 8 17 2}{it:...} {cmd:dofh(}{it:%th_halfyearly_date_exp}{cmd:)} {it:...} {space 2} returns {cmd:%d} ({cmd:%td}) date{p_end}
{p 8 17 2}{it:...} {cmd:dofy(}{it:%ty_yearly_date_exp}{cmd:)} {it:...} {space 6} returns {cmd:%d} ({cmd:%td}) date{p_end}

{pstd}Conversion from %d (%td) dates:{p_end}
{p 8 17 2}{it:...} {cmd:dofd(}{it:%td_daily_date_exp}{cmd:)} {it:...} {space 7} returns {cmd:%d} ({cmd:%td}) date{p_end}
{p 8 17 2}{it:...} {cmd:wofd(}{it:%td_daily_date_exp}{cmd:)} {it:...} {space 7} returns {cmd:%tw} date{p_end}
{p 8 17 2}{it:...} {cmd:mofd(}{it:%td_daily_date_exp}{cmd:)} {it:...} {space 7} returns {cmd:%tm} date{p_end}
{p 8 17 2}{it:...} {cmd:qofd(}{it:%td_daily_date_exp}{cmd:)} {it:...} {space 7} returns {cmd:%tq} date{p_end}
{p 8 17 2}{it:...} {cmd:hofd(}{it:%td_daily_date_exp}{cmd:)} {it:...} {space 7} returns {cmd:%th} date{p_end}
{p 8 17 2}{it:...} {cmd:yofd(}{it:%td_daily_date_exp}{cmd:)} {it:...} {space 7} returns {cmd:%ty} date{p_end}


{pstd}
Note that function {cmd:dofd()} is the identity function; it is included
only for completeness.

{pstd}
See {help tdates} for an explanation of {cmd:%t} dates.  See help
{help tfmt} for an explanation of time-series formats.

{pstd}
The table below shows how to convert from any {cmd:%t} format to any other
{cmd:%t} format.  The rows indicate the input type and the columns the output
type.  For instance to go from a {cmd:%tm} monthly date format to a {cmd:%th}
half-yearly date format you look at the third row (m) and fifth column (h) to
see that {cmd:hofd(dofm(}{it:m}{cmd:))} is the desired combination of
functions.

I{c |} Out
n{c |}   d{col 17}w{col 31}m{col 45}q{col 59}h{col 73}y
{hline 1}{c +}{hline}
d{c |}{cmd:dofd(}{it:d}{cmd:)} {cmd:wofd(}{it:d}{cmd:)}{space 7}{cmd:mofd(}{it:d}{cmd:)}{space 7}{cmd:qofd(}{it:d}{cmd:)}{space 7}{cmd:hofd(}{it:d}{cmd:)}{space 7}{cmd:yofd(}{it:d}{cmd:)}
w{c |}{cmd:dofw(}{it:w}{cmd:)}{space 15}{cmd:mofd(dofw(}{it:w}{cmd:))} {cmd:qofd(dofw(}{it:w}{cmd:))} {cmd:hofd(dofw(}{it:w}{cmd:))} {cmd:yofd(dofw(}{it:w}{cmd:))}
m{c |}{cmd:dofm(}{it:m}{cmd:)} {cmd:wofd(dofm(}{it:m}{cmd:))}{space 15}{cmd:qofd(dofm(}{it:m}{cmd:))} {cmd:hofd(dofm(}{it:m}{cmd:))} {cmd:yofd(dofm(}{it:m}{cmd:))}
q{c |}{cmd:dofq(}{it:q}{cmd:)} {cmd:wofd(dofq(}{it:q}{cmd:))} {cmd:mofd(dofq(}{it:q}{cmd:))}{space 15}{cmd:hofd(dofq(}{it:q}{cmd:))} {cmd:yofd(dofq(}{it:q}{cmd:))}
h{c |}{cmd:dofh(}{it:h}{cmd:)} {cmd:wofd(dofh(}{it:h}{cmd:))} {cmd:mofd(dofh(}{it:h}{cmd:))} {cmd:qofd(dofh(}{it:h}{cmd:))}{space 15}{cmd:yofd(dofh(}{it:h}{cmd:))}
y{c |}{cmd:dofy(}{it:y}{cmd:)} {cmd:wofd(dofy(}{it:y}{cmd:))} {cmd:mofd(dofy(}{it:y}{cmd:))} {cmd:qofd(dofy(}{it:y}{cmd:))} {cmd:hofd(dofy(}{it:y}{cmd:))}
{hline 1}{c BT}{hline}


{title:Examples}

{phang}{cmd}. gen qdate = qofd(date){p_end}
{phang}. collapse (sum) cost rev, by(qdate)

{phang}. gen half = hofd(dofm(month)){txt}


{title:Also see}

{psee}
Manual:  {bf:[D] functions},{break}
{bf:[U] 24 Dealing with dates},{break}
{bf:[U] 24.3.4 Translating between time units}

{psee}
Online:  {help tdates},
{help tfmt};
{help dates},
{helpb format},
{help functions}
{p_end}