search for: billemont

Displaying 3 results from an estimated 3 matches for "billemont".

2005 Nov 13
1
selection of missing data
...ble to make the same thin as ifelse(mela3,Skin & s.c== 0, 0,NA) with more than colomn and after to exclude of my data the Na with na.omit. The last question is how can i omit only the row which are NA value for the colomn metastasis c(11:12,14:21,23,24)) Thank you for your help Bertrand billemont [[alternative text/enriched version deleted]]
2006 Jan 02
0
cox model test heterogeinity
...k on the breast cancer. I made a cox model and i want to do a test of heterogeneity. Do you know how i can do this with R. I'm sorry for this question wich seems to be easy for you. I read the manual and the help and i don't find it. Thanks for your help Bertrand Billemont
2006 Jan 03
0
cox model
...y of residual by study the proportional risk. So i used Coxzph formula, but the global test is p< 0.05, so my model is not a proportional risk. Do you know how i can cut the cox model analysis before the 150 month, wich are the time where the curves are crossing? Thank you for your Help Dr Billemont