tsfill.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}
{* 07mar2005}{...}
{cmd:help tsfill}{right:dialog:  {bf:{dialog tsfill}}}
{hline}

{title:Title}

{p2colset 5 20 22 2}{...}
{p2col :{hi:[TS] tsfill} {hline 2}}Fill in missing times with missing 
observations in time-series data{p_end}
{p2colreset}{...}


{title:Syntax}

{p 8 16 2}
{cmd:tsfill} [{cmd:,} {opt f:ull}]

{phang}
You must {helpb tsset} your data before using {cmd:tsfill}.


{title:Description}

{pstd}
{cmd:tsfill} is used after {cmd:tsset} to fill in gaps in time-series data and
gaps in panel data with new observations, which contain missing values.  For
instance, perhaps observations for 
{bind:{it:timevar} = 1, 3, 5, 6, ..., 22} exist.  {cmd:tsfill} would
create observations for {it:timevar} = 2 and {it:timevar} = 4 containing all
missing values.  There is seldom reason to do this because Stata's time-series
operators consider {it:timevar} not the observation number.  Referring to
{cmd:L.gnp} to obtain lagged {cmd:gnp} values would correctly produce a
missing value for {it:timevar} = 3, even if the data were not filled in.
Referring to {cmd:L2.gnp} would correctly return the value of {cmd:gnp} in the
first observation for {it:timevar} = 3, even if the data were not filled in.


{title:Option}

{phang}
{cmd:full} is for use with panel data only.  With panel data, {cmd:tsfill} by
default fills in observations for each panel according to the minimum and
maximum values of {it:timevar} for the panel.  Thus if the first panel
spanned the times 5-20 and the second panel the times 1-15, after {cmd:tsfill}
they would still span the same time periods; observations would be created to
fill in any missing times from 5-20 in the first panel and from 1-15 in the
second.

{pmore}
If {cmd:full} is specified, observations are created so that both panels span
the time 1-20, the overall minimum and maximum of {it:timevar} across panels.


{title:Examples}

{psee}{cmd:. tsfill}{p_end}

{psee}{cmd:. tsfill, full}{p_end}


{title:Also see}

{psee}
Manual:  {bf:[TS] tsfill}

{psee}
Online:  {helpb tsappend}, {helpb tsset}{p_end}