> I would suggest you the "R" software (http://r-project.org) which is free Apologies - the address is of course http://www.r-project.org Zdenek Skala --- Odchoz? zpr?va neobsahuje viry. Zkontrolov?no antivirov?m syst?mem AVG (http://www.grisoft.cz). Verze: 6.0.231 / Virov? b?ze: 112 - datum vyd?n?: 12.2.2001