icenReg (version 1.3.5)

miceData: Lung Tumor Interval Censored Data from Hoel and Walburg 1972

Description

RFM mice were sacrificed and examined for lung tumors. This resulted in current status interval censored data: if the tumor was present, this implied left censoring and if no tumor was present this implied right censoring. Mice were placed in two different groups: conventional environment or germ free environment.

Usage

data(miceData)

Format

A data frame with 144 rows and 3 variables

• l left side of observation interval
• u right side of observation interval
• grp Group for mouse. Either ce (conventional environment) or ge (grem-free environment)

Source

Hoel D. and Walburg, H.,(1972), Statistical analysis of survival experiments, The Annals of Statistics, 18, 1259-1294

Examples

data(miceData)
	
coxph_fit <- ic_sp(Surv(l, u, type = 'interval2') ~ grp, 
                   bs_samples = 50,	
                   data = miceData)
	
#In practice, more bootstrap samples should be used for inference
#Keeping it quick for CRAN testing purposes 
	
summary(coxph_fit)