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Table 4 Estimates of survival probabilities (mean over 500 simulations) at the 1st, 2nd and 3rd quantile of survival times of Weibull distribution with different values of binary covariates and the mean value of continous covariate for sample size 50 and censoring 50%

From: On estimation for accelerated failure time models with small or rare event survival data

Binary covariate

Quartiles

True

MLE

Firth

X2=0

1st

0.750

0.780

0.769

 

2nd

0.500

0.543

0.529

 

3rd

0.250

0.294

0.278

X2=1

1st

0.750

0.757

0.751

 

2nd

0.500

0.498

0.499

 

3rd

0.250

0.247

0.249