Hi, I have to run lots of simulations based on several spatial scan statistics. Since the main overhead is due to a call to 'apply' , I was wondering whether it could be possible to parallelize this "loop". I know there are a few packages for parallel computing in R but I don't know whether it's worth trying them. Have anyone used these packages before? I have a linux machine with two 700-MHz processors and 256 Mb RAM. I know it's not too much, but I hope to save some time by using both processors. Thank you in advance. -- Virgilio G?mez Rubio Grup d'Estad?stica espacial i temporal en Epidemiologia i medi ambient Dpto. Estad?stica e I. O. - Facultat de Matem?tiques Avda. Vicent A. Estell?s, 1 - 46100 Burjassot Valencia - SPAIN http://matheron.uv.es/~virgil TLF: 00 34 96 354 43 62 - FAX: 00 34 96 354 47 35