coxsIndex: Cox's Proportional Hazards Index (Cox's C)

In imt: Impact Measurement Toolkit

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.

imt documentation built on Sept. 11, 2024, 5:41 p.m.