# hazard ratios

1. ### Cox regression model, hazard ratio , using categorical data.

Hello everyone! I am studying the effect of 8 arm of treatments on a cohort of 80 mice. The variable I have are: time status and arm of treatment. I generated KM curves and obtained by log rank test both a general p.value and pairwise comparisons between couples of curves. Then, I needed...
2. ### Another, more difficult Cox Regression/Hazard Ratio interpretation question

So, for an assignment, we were given this data taken from the Stanford Heart Study from 1978 or so: I used equal signs because I thought dashes might be confusing. They haven no mathematical function in the following 'tables' The variables in question are: Age in years in reference to age 48...
3. ### Cox Regression/Hazard Ratio interpretation question

Hi, all. I've done all the coding already for this, I just don't know how to interpret it. For an assignment, we were given this data taken from the Stanford Heart Study from 1978 or so: I used equal signs because I thought dashes might be confusing. They haven no mathematical function in the...
4. ### Question about Hazard Ratio Interpretation

Hi, all. I've done all the coding already for this, I just don't know how to interpret it. For an assignment, we were given this data taken from the Stanford Heart Study from 1978 or so: I used equal signs because I thought dashes might be confusing. They haven no mathematical function in the...
5. ### How to use instrumental variable to estimate hazard ratios and 95% CI?

Hi, I am doing a Mendelian randomization analysis, by using an instrumental variable (Z, which is the genotype of exposure variable X), to investigate whether there is a causal association of genetically determined X on survival (Y). Suppose that Y includes information of both a dichotomized...
6. ### Odds Ratio and Hazard Ratio - HELP!

I am trying to figure out how to calculate an estimated hazard ratio associated with a specific variable. I have the estimate and standard errors from SAS. I have a formula e^beta(Xa-Xb) for each individual. Just not sure what I should use for Xa and Xb. Also trying to calculate statistical...