YPmodelPhreg-package: The Short-Term and Long-Term Hazard Ratio Model with...

In YPmodelPhreg: The Short-Term and Long-Term Hazard Ratio Model with Proportional Adjustment

The Short-Term and Long-Term Hazard Ratio Model with Proportional Adjustment

Description

This package fits a semiparametric short term and long term hazard ratio model for the group variable, adjusted for proportional covariate effects. The model was studied in Yang and Prentice (2015), and it extends the two sample results in Yang and Prentice (2005). The model accommodates various non-proportional hazards scenarios including those with crossing hazards or survival functions. The main function of the package is ypreg, which provides the estimates and confidence intervals of the model parameters, the average hazard ratio, and the hazard ratios at user-specified time points. Plots of point-wise and simultaneous confidence bands are also given.

Details

Package:	YPmodelPhreg
Type:	Package
Version:	1.0.0
Date:	2023-04-21
License:	GPL (>= 3)

Value

No return value, called for side effects

Author(s)

Daewoo Pak and Song Yang Maintainer: Daewoo Pak <[e-mail]>

References

Yang, S., & Prentice, R. (2005). Semiparametric analysis of short-term and long-term hazard ratios with two-sample survival data. Biometrika, 92(1), 1-17.

Yang, S., & Prentice, R. L. (2015). Assessing potentially time-dependent treatment effect from clinical trials and observational studies for survival data, with applications to the Women's Health Initiative combined hormone therapy trial. Statistics in medicine, 34(11), 1801-1817.

See Also

ypreg

Examples

library(YPmodelPhreg)
data(colonexample)
head(colonexample)

res <- ypreg(colonexample, time.hr = c(1, 7))
res
plot(res)

YPmodelPhreg documentation built on July 9, 2023, 6:09 p.m.