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Re: st: RE: Using lagged variables in panel data analysis


From   Edward James <ej111005@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Using lagged variables in panel data analysis
Date   Thu, 19 Jan 2012 09:31:10 +0900

Thanks, Nick.
I will try following your suggestion.

2012/1/18 Nick Cox <njcoxstata@gmail.com>:
> No; I don't mean that.
>
> First, -tsset- (or -xtset-) is not a prerequisite for using subscripts.
>
> Second, I am as said recommending -tsset- (or -xtset-) followed by
> time series operators such as L.
>
> Time series operators do the right thing with panels and they do the
> right thing with gaps in the data.
>
> This is all well documented: e.g. start with -help tsvarlist-.
>
> Nick
>
> On Wed, Jan 18, 2012 at 12:16 AM, Edward James <ej111005@gmail.com> wrote:
>> Thank you Nick.
>>
>> You mean do I have to conduct -tsset- command first and then make
>> lagged variables using -x[_n-1]-?
>>
>>
>>
>> 2012/1/18 Nick Cox <n.j.cox@durham.ac.uk>:
>>> It is usually better to create lagged variables with panel data using -tsset- or -xtset- followed by L.
>>>
>>> You will always have the problem that there is no value before the first.
>>>
>>> -drop-ping the first in each panel just makes your plight worse by throwing away some of your data. It can't solve this problem.
>>>
>>> On the whole, you need do nothing here: Stata's time series and panel commands do what they can with missing values, which usually means ignoring them.
>>>
>>> Nick
>>> n.j.cox@durham.ac.uk
>>>
>>> Edward James
>>>
>>> I have a question for conducting a panel data analysis.
>>>
>>> I make some lagged variables using "x[_n-1]" commands from 1980 to
>>> 2007 and want to conduct GLS.
>>>
>>> When I make lagged variables, is the case of the first period supposed
>>> to be "."? But it has a unknown value as you can see below.
>>>
>>>
>>>        +----------------------------------------+
>>>        country   year   cpiannual   lcpiann~l
>>>        ----------------------------------------
>>> 197.    Germany   1980    5.441055    1.488074
>>> 198.    Germany   1981    6.344242    5.441055
>>> 199.    Germany   1982    5.241046    6.344242
>>> 200.    Germany   1983    3.293413    5.241046
>>> 201.    Germany   1984    2.405797    3.293413
>>>        ----------------------------------------
>>>
>>> In this case, should I drop the case of 1980?
>>>
>
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