Displaying 2 results from an estimated 2 matches for "x5factor_final".
2011 May 22
1
How to calculate confidence interval of C statistic by rcorr.cens
...> MyModel.lrm.rcorr
C Index Dxy S.D. n
missing uncensored
0.8222785 0.6445570 0.1047916 104.0000000
0.0000000 104.0000000
Relevant Pairs Concordant Uncertain
3950.0000000 3248.0000000 0.0000000
> CstatisticCI(x5factor_final.lrm.pen.rcorr)
Low95 Upper95
C Index 0.8222785 0.8021382 0.8424188
I'm not sure what "S.D." in object of rcorr.cens means. Is this standard
deviation of "C Index" or standard deviation of "Dxy"?
I thought it is standard deviation of "C...
2011 May 15
5
Question on approximations of full logistic regression model
Hi,
I am trying to construct a logistic regression model from my data (104
patients and 25 events). I build a full model consisting of five
predictors with the use of penalization by rms package (lrm, pentrace
etc) because of events per variable issue. Then, I tried to approximate
the full model by step-down technique predicting L from all of the
componet variables using ordinary least squares