Adolfo,

Welcome to the GRETL list. You need to tell GRETL
that your file is a times-series structure. With the data
loaded click
DATA > DATA STRUCTURE > TIME SERIES > ...
then be prepared to note whether it is annual, quarterly,
etc., and be prepared to enter the starting date of the
series. Your data well then be recognized as time series.
Be sure to save the data as a GRETL file so as not to lose
the new structure.

Peter

At 05:02 PM 6/21/2008, you wrote:

I'm new in using Gretl, and I have a problem.

I have imported a database in CSV format, and get it opened without a
problem. But when I open "add" from the main bar, the command "first
differences in selected variables" are not operational (disabled?). I
need first differences because I have encountered colinearity.

Also, when I run a OLS regression, the results of the Durbin-Watson are not
shown.

This not happens when I am using a "sample file".

Can you help me, please?

Un saludo

Adolfo

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