HLTC22H3 Lecture Notes - Lecture 9: Nonprobability Sampling
Document Summary
Age effects (biological changes) cohort effects (something in generation) environmental effects (point in time) Group of people in 1 point of time. Cohort effects - education (younger had more education) Group of people in 2/more periods of time. How aging effects intelligence overtime; test same age group at different intervals (ex. From 25 to 80 years old --> same group from start to end) Same age, diff periods of time (25 year olds in 70s, 80s etc. ) Series of cross-sectional and put them in longitudinal. Pro: gather wide range of data on lot of issues & can generalize. Process of selecting small sample that can generalize results to population. Items drawn from population in such way each time an item was selected, every item in population had equal opportunity to appear in sample. Actual sample size of survey usually compromise between level of precision to be achieved, survey budget and time constraints.
