On Sat, 13 Oct 2012, redwan ahmed wrote:
 i have 2 years of data and i pooled them. then i run 
 heteroskedasticity-corrected estimator found in gretl. 
 however, i am not sure whether this estimator is the same of 
 feasible GLS i have red about in gretl guidelines and stated 
 i woolderege book (2003). please, help me on this matter. 
There is an explicit account of the algorithm for gretl's 
"hsk" command in the help entry for hsk.
Allin Cottrell