Dear all, I was searching for this artical but i couldn't find it if any one know which web library i can access this artical. Harrell FE et at ., Statistics in Medicine 1996, vol. 15, 361-387. Thanks in advances. Gorge _________________________________________________________________ STOP MORE SPAM with the MSN Premium and get 2 months FREE* http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=http://hotmail.com/enca&HL=Market_MSNIS_Taglines