Table 1 

Simulation design for the simulation studies – predictor variables 

Predictor variables 



X_{1} 
~N(0, 1) 
X_{2} 
~M(2) 
X_{3} 
~M(4) 
X_{4} 
~M(10) 
X_{5} 
~M(20) 


The predictor variables are sampled independently from the following distributions. N(0, 1) stands for the standard normal distribution, M(k) stands for the multinomial distribution with values in {0,..., k  1} and equal probabilities (discrete uniform distribution on {0,..., k  1}), B(p) stands for the binomial distribution (Bernoulli distribution) with probability p, thus M(2) equals B(0.5). 

Strobl et al. BMC Bioinformatics 2007 8:25 doi:10.1186/14712105825 