Questions tagged [hazard]
The hazard rate is the instantaneous rate at which units that have survived until time $t$ die at $t$. The hazard ratio is the ratio of 2 specified hazards.
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Cox regression baseline risk and interpretation of coefficients
I recently encountered a problem with Cox regression that I couldn't find an answer to (please direct me to the appropriate resources if you know of any). So the problem goes as follows:
I have a ...
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How can a hazard function be negative?
I've been reading through Survival Analysis in R, an ebook that I found for independent study, and have run into a point of confusion. They define the hazard function as follows:
where T is whichever ...
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How to find difference between two hazard ratios (ratio of hazard ratios)
I am reading a meta-analysis and in this paper the authors somehow compared HR from two groups with different treatments in each study. As I know, we can compare outcomes from two groups with ...
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How to explain Hazard Ratio in layperson's terms
In the context of a Cox regression, I recently heard someone say that "the hazard ratio of 0.70 between the two treatment groups indicates that, during the whole followup time, of 100 persons in ...
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In which cases should the time be transformed when plotting the smoothed scaled Schoenfeld residual plot?
I previously asked this question but didn't get any answers, so I'm reposting it now.
I aim to address the argument transform = '' in R, particularly concerning the ...
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Should the curve be around zero when assessing the smoothed scaled Schoenfeld residual plot for proportional hazard assumption?
I'm using the smoothed scaled Schoenfeld residual plot to assess the proportional hazard assumption. I have a decent understanding of what a smoothed scaled Schoenfeld residual plot shows, but I'm ...
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Does it make sense to convert the Y-axis by exp() on the smooth scaled schoenfeld residual plot?
I posted a question on Stack Overflow. But the question got closed as the person who closed it wrote that it should belong here in Stack Exchange. I'm not sure why but here is the link for the post. I'...
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How to assess the goodness-of-fit of an extended Cox model?
I'm trying to build an extended Cox hazard model on a dataset with time-varying covariates, using Python's Lifeline package. However, I've a hard time trying to find out how I can assess the goodness-...
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Pooled Hazard Ratio or Crude events (M-H to RR or OR) for mortality outcomes in Meta-Analysis?
I'm performing a MA to estimate the effect of treatment A respect to Placebo (or propensity-matched control group) respect to all-cause death.
All the studies included in my MA report both crude ...
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How do I incorporate background mortality to produce an excess hazard model using flexsurv?
The flexsurv package in R facilitates the use of background mortality estimates to model excess hazard. In the examples I can find (the ...
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Start of instantaneous hazard rate
I'm looking at survival of organizations, with survival in years. I want to produce an instantaneous hazard plot with a confidence interval. I first used pehaz from ...
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When should the robust error function in R be used in Cox proportional hazard regressions?
Let's consider a scenario where I compute a HR that appears to violate the proportional hazard assumption according to the cox.zph test, but when plotting the ...
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How do I interpret the HRs for each time interval computed by survSplit in R?
I’m testing the association between an exposure and outcome. I have performed a Cox proportional hazard model in R and estimated a HR. Both the exposure and the outcome are binary variables, where 1 = ...
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Return period of vine copula
In the formula for "OR" joint return period of 3-dimensional copula modeling, we need to find C(u,v,w) but when we model using vine, we are only able to obtain the copula C(uv|w). So, how to ...
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Bayesian Approach to Estimating Item Return Probability Given Time Since Sale
I'm attempting to estimate the probability of an item being returned given that X days have passed since the sale, using a Bayesian approach. I can calculate the overall probability of an item being ...
