PSYCH 100B Lecture Notes - Lecture 10: Time Point, Relative Risk, Random Assignment
Document Summary
A variable of interest is age which cannot be assigned/manipulated quasi variable. Cross sectional study: do it at one time point and get groups of people of different ages. E. g. memory abilities over different decades; ability to recall words from a list. Gather the same number of participants for each age group. Measure memory ability on the same test. Analyze using a one way anova have to do post hoc tests. We can"t say that aging causes a decline in memory. May be due to age or other factors. Life was a different way growing up for different groups of people. 70 y/o may have different experiences in their 20s. E. g. recruit only one age group (e. g. 10 y/o) and collect data at different time points (in their 20s, 30s, etc) Mortality: subject drop out and literal mortality. There may be systematic differences between people who stay in study and people who drop out influences data.
