Displaying 3 results from an estimated 3 matches for "streg".
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streq
2008 Apr 28
1
Survival Regression with multiple events per subject
Dear R users!
I want to process a maximum likelihood estimation for a parametric
regression survival time model with multiple events per subject.
the STATA command for this survival regression is:
use survreg
stset failure(exercise), id(optionid)
local regressors itm posret negret
streg `regressors', distribution(weibull)
explanation:
stset declares data to be survival-time data;
exercise is the indicator variable, which shows if the subject is dead or
alive;
optionid is the multiple-record ID variable which means every subject has a
unique id and one subject can have multipl...
2011 Feb 25
1
Forced inclusion of varaibles in validate command as well as step
...T, sep=",")
attach(data1)
coxmodel4 <- coxph(formula=Surv(OS,mors) ~
iAJCC2+iAJCC3+iPS2+iPS3++alder_diag+gender+vol_GTV+iforb2+iforb3+hem_LNL+ser
o_thromb+LDH_UNL+ALAT_UNL+BASP_UNL+sero_bili+resection_perf+sero_WBC,
data=data1, x=TRUE, y=TRUE,method=c("efron"))
coxmodel.streg<-step(coxmodel4)
I would like to "lock" iAJCC2 iAJCC3 and iPS2 + iPS3 regardless, but I
cannot seem to get the step function to accept this.
Further
Once I have the model I would like to validate it with the validate command
I am presently using this****************...
2012 Jul 06
4
differences between survival models between STATA and R
Dear Community,
I have been using two types of survival programs to analyse a data set.
The first one is an R function called aftreg. The second one an STATA
function called streg.
Both of them include the same analyisis with a weibull distribution. Yet,
results are very different.
Shouldn't the results be the same?
Kind regards,
J
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