sven, currently smpl 1 20 corr smpl+1+1 and corr smpl+1+1 corr on the raw data for 20 data points <br>is quite laborious     want to is to loop the corr on 20 points and write the output of corr to a series save on gretl for more other calculation   that why ask what is the accessor to retrive the output of corr and to write to the series and save<br>