On Wed, 1 Dec 2010, Yangbo Du wrote:
Thank you very much for your response. Is long-differencing
supported
by gretl as well? I am trying to compare estimators for fixed effects,
first differences, and long differences to check for the possibility of
errors-in-variables.
You can difference in any way you like, e.g.
Dy = y - y(-10) # y_t - y_{t-10}
Dy = y - y[1] # y_t - y_1
Allin Cottrell