Thank-you to all who replied. These included all the information I needed, SAS programmes, spread sheets and detailed instructions. These replies were,in fact, SO datailed, with various attachements, that I cannot report back to the whole list. Please contact me directly if you want a digest. ZJ Nugent, PhD Health Outcomes Analyst CancerCare Manitoba 675 McDermot Ave Winnipeg R3E 0V9 CANADA