search for: stcox

...<linda.porz@gmail.com> Date: 2011/5/25 Subject: combined odds ratio To: r-help@r-project.org Cc: r-help-request@stat.math.ethz.ch Dear all, I am looking for an R function which does stepwise selection cox model in r (delta chisq likelihood ratio test) similar to the stepwise, pe (0.05) lr: stcox in STATA. I am very thankful for any reply. Regards, Linda [[alternative HTML version deleted]]

...ta I used (Stata) Here are the codes for R library(foreign) leukemia<-read.dta("leukemia.dta") library(survival) res <- coxph(Surv(TIME, STATUS)~TREAT, data=leukemia) summary(res) and here the codes for for stata use "leukemia.dta",clear stset TIME, failure(STATUS==1) stcox TREAT SPSS and EPIinfo give the same HR than Stata I tried with an other database without any problem What would be the problem??? I changed of pc and versions of R (2.81 & 2.9.0) without any change. The means are the same for the two packages. I saw a few posts with discrepancies but with...

Hello, I am constructing a nomogram using cph and nomogram commands in Dr. Harrell's Design/RMS package. The HR that I obtain for dichotomous and categorical variables are identical to those that I obtain using STATA stcox. However, the inter-quartile HR I obtain for continuous variables is obviously different, since STATA gives me HR for each unit (year, centimeter, etc) like coxph would give. My question is if this will effect the output of the nomogram. I'm assuming that nomogram is constructed using hazard be...

Dear all, I am interested to evaluate reclassification using net reclassification improvement and Integrated Discrimination Index IDI after survival analysis (Cox proportional hazards using stcox). I search a R package or a R code that specifically addresses the categorical NRI for time-to-event data in the presence of censored observation and, if possible, at different follow-up time points. I know that the ?PredictABEL? Package contains functions for NRI and IDI calculation but it is uncl...

...R and CIs from coxph). I can report the Wald p-values instead, but I have read that the Wald test is inferior to the score test or LR test. My questions for survival analysis jockeys out there / TT: 1. Should I just stop here and use the wald.p.value? This appears to be what Stata does with the stcox function (albeit Breslow method). 2. Should I calculate HR and CIs that "agree" with the LR or logrank P? How do I do that? Thank you, Paul

...---------------------------------------------------- > -- 21 obs. remaining, representing 21 failures in single record/single failure data 78 total analysis time at risk, at risk from t = 0 earliest observed entry t = 0 . stcox accessin haz_wst haz_in haz_out wefgov rle rqe pol_free tai_2001 ny_gd eio, robust > nohr failure _d: ratify analysis time _t: yrs2 Iteration 0: log pseudo-likelihood = -49.054959 Iteration 1: log pseudo-likelihood = -45.021682 Iteration 2: log pseudo-likelihood...

...relative to the STATA output. This is tested across the different approximations, with consistent results. The comparison using Efron approximation and ordinal data is is below. Your advice is very much appreciated! Min-Han Apologies below for the slightly malaligned output. STATA output . xi:stcox i.Hist_Grade_4grp, efr i.Hist_Grade_~p _IHist_Grad_1-4 (naturally coded; _IHist_Grad_1 omitted) failure _d: FFR_censor analysis time _t: FFR_month Iteration 0: log likelihood = -1133.369 Iteration 1: log likelihood = -1129.4686 Iteration 2: log likelihood = -1129.3196 Ite...

Dear all, I am looking for an R function which does stepwise selection cox model in r (delta chisq likelihood ratio test) similar to the stepwise, pe (0.05) lr: stcox in STATA. I am very thankful for any reply. Regards, Linda [[alternative HTML version deleted]]