# Questions tagged [proportional-hazards]

Proportional hazards is an assumption of the Cox proportional hazards model of survival analysis and some other models as well. The assumption is that a linear increase in the predictor will have a uniform multiplicative relationship with the hazard.

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### Schoenfeld test (cox.zph) shows no covariate violates PH assumption but global test suggests whole model does (p<0.001). What to do?

Using cox.zph (part of the survival package), I find that no covariate violates the PH assumption in a Cox regression model (p > ...
1answer
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### How to model the Hazard Rate?

I'm interested in modeling the Hazard Rate $\lambda$ from a Survival dataset so I can calculate the Cumulative Distribution $F(t)=1-e^{-\lambda t}$ but I'm not sure how to go about computing $\lambda$...
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### Is the Cumulative Hazard Function simply estimated using the Empirical CDF?

I'm just starting to learn about Survival Analysis and I understand the theoretical proofs but I'm still unclear about how to do some of the estimations practically.
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### Cox Proportional Hazard calibration with same it's meant to predict

I want to model time to churn with a Cox Proportional Hazard model and use it to predict people likely to churn. The question I have is how valid is to calibrate the model with the same people I want ...
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### Days Between Visits Model

I have a dataset from a digital service on a user-level and want to model the decrease in visits and usage over time. I want to explain the decrease (or increase) with the activities a customer ...
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### How to calculate HR using attained age? [closed]

I want to calculate the hazard ratio for death by comparing individuals with a disease versus others without the disease, but I don't know if the calculation that I'm doing is correct. Participants ...
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### Should I correct the p-value when testing Proportionnal Hazard assumption with cox.zph()?

When testing the Proportionnal Hazard assumption in a cox model in R, you usually use the survival::cox.zph() function. Output is something like this: ...
1answer
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### Survival analysis of a population - Proportional hazards

first time here :) here's my problem. I developed an agent-based model (ABM) that I used to generate some data that I would like to analyze, but I couldn’t find a methodology that I can be confident ...
1answer
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### Can I force the direction of hazards ratio?

I am doing a survival analysis using Cox's proportional hazards model with several predictive variables. Some of the estimated hazards ratio goes in an implausible direction, which contradicts what we ...
1answer
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### Significant but very small beta coefficients in Cox proportional hazards calculation (survival analysis)

I'm analyzing TCGA data to investigate the effects of lncRNAs on survival. Among other things, I wanted to calculate a univariate CoxPH model for each gene to find genes whose expression levels have a ...