Hi Quang,
> My friend has a panel data in the following format:
>
> Year Investment
> 1900 . (Missing value)
> 1930 .
> 1960 12
> 1980 .
> 1990 28
> 1991 56
> 1992 35
> 1993 45
> etc.,
>
> Could you please tell me how she can use the dummy variables for this
> exercise (regression)? Also, how she can interprete the coeficients
> for Investment and the dummy variables?
>
If you are asking how to create indicators for the years that have
missings, simply
gen missdum=0
replace missdum=1 if investment==.
If this is not what you mean, you will need to explain what you want
to do further.
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