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st: Error: factor variables and time-series operators not allowed r(101)


From   ZA <zoolfee@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Error: factor variables and time-series operators not allowed r(101)
Date   Wed, 18 Jan 2012 11:03:41 +0100

Dear Statausers,

When I run this command:

tsset dtt
probit y l.x1 l.x2
mfx

I get the following error:

factor variables and time-series operators not allowed r(101);

What could be the reason for no mfx  for lagged variables in time-series?
Or am I missing something? Any comments would be appreciated.

Best,
---
Z Ahmed
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