On Tue, June 13, 2006 22:40, Daniel wrote:

> Im a novice at this so my question might be kind of simple but > does anyone know how to apply the HP-filter in gretl to alot of > time series. I have like 200 series to filter so doing it > manually is pretty time consuming... Loops are your friends; try this in the console or, better still, in a script: loop foreach i x y z series cyc_$i = hpfilt($i) series tre_$i = $i - cyc_$i end loop