New answers tagged cox-model
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What are the differences between PS-match and adjusted Cox regression?
There are huge differences. Suppose for example that age is a strong predictor of time until event. Adjusting for outcome heterogeneity due to age clarifies the picture is makes the proportional ...
- 98.4k
1
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Accepted
Multi-state Cox models: different formulas for different transitions?
survival package supports specifying terms for specific transitions only. Using your example transitions, it would look something like this:
...
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Can I use age as a time varying covariate in a Cox PH?
First, your use of groupage as a predictor doesn't represent the age of the individual that is at risk of the event, which is the usual ...
- 102k
4
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Accepted
Is it possible to perform a survival analysis in a patient population only, using their age of onset as time-to-event data?
The answer depends on what specific question you want to address.
Say that your interest is whether the age of onset of a disease differs with gender, your population of interest is only those who ...
- 102k
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The logrank test statistic is equivalent to the score of a Cox regression. Is there an advantage of using a logrank test over a Cox regression?
In the simple, semi-parametric Cox model
$$h(t | Z_i) = h_0(t) \exp(Z_i \times \beta)$$
where
$$
Z_i=
\begin{cases}
0 & \text{if subject $i$ is in the 1st group}\\
1 & \...
- 31.6k
2
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Accepted
Setting a reference in Cox regression with splines and interaction
The vignette you cite says:
The approach is appropriate for any term, not just psplines.
In terms of simply setting a reference, you thus are OK. You were smart enough to use the ...
- 102k
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probability that the failure is on the individual as observed
First, the definition of $\lambda(t)$ at the end of the question holds for continuous-time models. That's a general definition of the hazard function for any continuous probability distribution; it's ...
- 102k
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