[求助]stata中如何生成两阶以上的滞后变量

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<P>刚使用stata不久，在利用stata软件做分析中，如果我有一个变量是gdp的话，那么我想产生该变量的一阶滞后变量Lag_gdp，那么我可以采用如下命令：<BR><STRONG>gen Lag_gdp= L.gdp</STRONG></P>
<P>那么，我要产生gdp的二阶，三阶滞后变量如何些命令呢，请知道的高手指教啊</P>

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关键词：Stata 滞后变量 tata stata软件 GDP 如何 软件

How do I create a lag variable?

Title		Stata 5: Creating lagged variables
Author		James Hardin, StataCorp
Date		January 1996

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Create lag (or lead) variables using subscripts.

 . gen lag1 = x[_n-1] . gen lag2 = x[_n-2] . gen lead1 = x[_n+1] 

You can create lag (or lead) variables for different subgroups using the by prefix. For example,

 . sort state year . by state: gen lag1 = x[_n-1] 

If there may be gaps in your records and you only want to lag successive years, you can specify

 . sort state year . by state: gen lag1 = x[_n-1] if year==year[_n-1]+1 

See [R] egen for details on creating variables of moving averages.

I am trying to create a lag variable

y(t) = x(t-1)
I searched for a lag function but could not find. Any suggestions?

以下是引用Trevor在2006-4-30 7:53:00的发言：

I am trying to create a lag variable

y(t) = x(t-1)
I searched for a lag function but could not find. Any suggestions?

In addition to other suggestions, this
raises the question of how you are
searching.

A literal

. search lag function

does point to several sources on information.
However, as Kit Baum pointed out if your
data are time series then using -tsset- is
preferable to subscripting (e.g. using [_n-1]).

Nick
n.j.cox@durham.ac.uk

好帖子，俺也在愁这个问题，现在终于解决啦

感谢楼上的兄弟！

谢谢楼上的回答，俺也在寻找问题的答案，学习喽。

学习，学习。我也在找

啊   还是不行啊

ok了 太好了

sort county year
by county: gen laglcrmrte1 = lcrmrte[_n-1] if year==year[_n-1]+1