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st: ERROR: sample may not include multiple panels

From   Hobst <>
Subject   st: ERROR: sample may not include multiple panels
Date   Fri, 6 Aug 2010 07:12:19 -0700 (PDT)


i defined my paneldata using the following code

encode model, gen(numeric_model)
gen datevar=monthly(month,"M20Y") 
format datevar %tm

sort numeric_model datevar
xtset numeric_model datevar

Now, if i want to make tests such as xcorr, as or dfuller i get the
following error message:

"sample may not include multiple panels"

Has anybody got an idea why i get this error? Where does stata see the
"multiple panels"?

Thank you, Regards
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