coxsIndex {imt} | R Documentation |
Cox's Proportional Hazards Index (Cox's C)
Description
Calculates Cox's C, a standardized effect size measure for comparing hazard rates between two groups in survival analysis.
Usage
coxsIndex(p_t, p_c, n_t, n_c)
Arguments
p_t |
Numeric value representing the proportion of events (e.g., failures, deaths) in the treatment group. |
p_c |
Numeric value representing the proportion of events in the control group. |
n_t |
Numeric value representing the sample size of the treatment group. |
n_c |
Numeric value representing the sample size of the control group. |
Details
Cox's C is a useful effect size for survival analysis when hazard ratios are not constant over time. It's calculated based on the log odds ratio of events and includes a small sample size correction. The value 1.65 is used to approximate a conversion to a Cohen's d-like scale.
Value
The calculated Cox's C effect size.
References
Cox, D. R. (1972). Regression models and life-tables. Journal of the Royal Statistical Society: Series B (Methodological), 34(2), 187-202.