Stata handles factor (categorical) variables elegantly.
You can prefix a variable with i. to specify indicators for each level (category) of the variable.
You can put a # between two variables to create an interaction–indicators for each combination of the categories of the variables. You can put ## instead to specify a full factorial of the variables—main effects for each variable and an interaction.
If you want to interact a continuous variable with a factor variable, just prefix the continuous variable with c..
You can specify up to eight-way interactions.
xtlsdvc lnstock lnwgi lngdp risk1 open year,initial(ah)
Bias correction initialized by Anderson and Hsiao estimator
timevar (year) may not contain missing values when option full is specified
r(451);
我是运行xtlsdvc 报错，麻烦各位指教，多谢
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