[R] non-cumulative hazard in Cox model with time-dependent covariates
Dear all,
Is there a way to calculate the non-cumulative hazard (instantaneous
hazard), which is the product of baseline hazard and exp{beta*covariate} ?
I knew in survfit, we can get the estimator of cumulative baseline hazard,
but how can we get the non-cumulative one?
Thank you very much!
Koshihaku
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[R] How to get the hazard of coxph (not cumulative hazard)
Dear all,
I think the coxph and survfit.coxph can give the cumulative hazard of cox
model.
But is there any method to calculate the hazard
Lambda(t)=lambda_0(t)*exp{beta*X(t)}?
Any suggestion will be great help.
Thank you very much!
Koshihaku
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Re: [R] Is the output of survfit.coxph survival or baseline survival?
Dear all, Your advices was a great help to my study.Thank you very much! -- View this message in context: http://r.789695.n4.nabble.com/Is-the-output-of-survfit-coxph-survival-or-baseline-survival-tp3861919p3873512.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Is the output of survfit.coxph survival or baseline survival?
Dear all,
I am confused with the output of survfit.coxph.
Someone said that the survival given by summary(survfit.coxph) is the
baseline survival S_0, but some said that is the survival S=S_0^exp{beta*x}.
Which one is correct?
By the way, if I use newdata= in the survfit, does that mean the survival
is estimated by the value of covariates in the new data frame?
Thank you very much!
Koshihaku
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Re: [R] How does the survfit.coxph calculate the survival value?
Dear Professor Terry Therneau, Sorry for another naive question about R. Some one suggested me to use mathematica to analyze Cox proportional hazard model. For example estimate the coefficients, and calculate the survival and hazard function. But I think that may be not possible, especially that all the six covariates in my model are time-dependent. Could you please give me any opinion on this? Koshihaku -- View this message in context: http://r.789695.n4.nabble.com/How-does-the-survfit-coxph-calculate-the-survival-value-tp3847179p3853994.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How does the survfit.coxph calculate the survival value?
Thank you very much!
I am analyzing software stress test data using R, and fiting data by coxph.
I think the survfit.coxph can give the estimated baseline survival S_0(t_i),
and we can calculated the survival S(t_i) by using S_0(t_i) and the x(t_i).
Then can I use the function lambda={S(t_(i-1))-S(t_i)}/S(t_(i-1)) to
calculate the hazard at time t_i ?
Koshihaku
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[R] How does the survfit.coxph calculate the survival value?
Sorry for a long question. I am in an urgent using R to fit the cox proportional model. My data is a data frame including 100 individuals which are software stress tests. There are time-to-failure and six covariates meaning the system resource (every 4 minutes). Is it possible to use R to fit the Cox model? I used *coxph* to estimated the coefficients for both time-independent and time-dependent covariates. And next I need to calculated the survival and hazard rate for cox model with time-independent and that with time-dependent covariates. I see many people use *survfit.coxph *to get the survival. Could anybody please tell me how is the survival value calculated? For example, what kind of procedure. Any suggestion is a great help! -- View this message in context: http://r.789695.n4.nabble.com/How-does-the-survfit-coxph-calculate-the-survival-value-tp3847179p3847179.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Does the bashaz give the breslow estimator of baseline hazard?
Dear R-users, I am checking the Cox proportional hazard model with six covariates, and all of them are time-dependent. I fitted cox model and try to get the beslow estimator for the baseline cumulative hazard function. My question is whether the result of basehaz is actually a breslow estimator for baseline cumulative hazard. If basehaz does not give me breslow estimator, please advise on how I can get it. Thanks for any suggestion given. kind regards, Koshihaku -- View this message in context: http://r.789695.n4.nabble.com/Does-the-bashaz-give-the-breslow-estimator-of-baseline-hazard-tp3849834p3849834.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
