title: Conservatism of the approximation sigma (O-E)2-E in the logrank test for survival data or tumor incidence data.
mesh_terms: D000818:Animals; D001699:Biometry; D002273:Carcinogens; D006801:Humans; D009374:Neoplasms, Experimental / Q000139:chemically induced / Q000453:epidemiology / Q000401:mortality; D011336:Probability; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D002273:Carcinogens