@booklet {cleliadiserio-sspftcm2007,
	title = {Simpson S Paradox for the Cox Model},
	howpublished = {Discussion Papers},
	year = {2007},
	month = {1},
	publisher = {Scandinavian Journal of Statistics 36, 463-480 (2009)},
	abstract = {{In the context of survival analysis, we define a covariate X as protective (detrimental) for the failure time T if the conditional distribution of [T | X = x] is stochastically increasing (decreasing) as a function of x. In the presence of another covariate Y, there exist situations where [T | X = x},
	url = {/files/dp441.pdf},
	author = {Clelia Di Serio, Yosef Rinott and Marco Scarsini}
}
