Pia Svedberg, Margaret Gatz, Nancy L Pedersen
Genetic and environmental mediation of the associations between self-rated health and cognitive abilities
Experimental aging research
key issues epidemiologic research overview objectives methods epidemiologic research fundamentals epidemiologic research types epidemiologic research design options observational studies typology observational study designs measures disease frequency incidence measures disease frequency measures association measures potential impact summary measures validity epidemiologic research validity general considerations selection bias information bias confounding confounding involving several risk factors principles procedures epidemiologic analysis statistical inferences effect measures simple analysis overview options control extraneous factors stratified analysis matching epidemiologic studies interaction effect modification synergism modeling theoretical considerations modeling analysis strategy applications modeling interaction applications logistic regression interaction using unconditional ml estimation applications modeling conditional likelihood estimation appendices index