hazard ratios

  1. K

    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. A

    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. A

    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. A

    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. X

    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. L

    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...