PSYCO223 Chapter Notes - Chapter 3: Institutional Review Board, Prunus Spinosa, Internal Validity
1 Nov 2016
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Aging linked with chronological age, but not identical, but it is a time dependent process. Useful for indexing time and organizing events and data: assume: effects of aging are correlated with chr. Age groups or within a person at different chr. Cross sectional: year of birth, year of test. Aka a cohort: compared people in different age groups at a single point in time: a cohort. People who experience the world the same way (1930s to 1960s: quick, only measure once, but tend to exaggerate differences, confound: cohort effect. Results reflect age differences not changes because age effects may be due to cohort differences. Why older people are slower could be attributed to computer anxiety (cohort differences) All results are recorded at one time in history. Group of 80 year olds you are studying are the group of survivors. Need to decide ho(cid:449) you"re goi(cid:374)g to di(cid:448)ide up your sa(cid:373)ple (cid:894)set age ra(cid:374)ges to deter(cid:373)i(cid:374)e (cid:862)old(cid:863) or (cid:862)you(cid:374)g(cid:863)(cid:895)
