PSY 0035 Lecture Notes - Lecture 14: Sampling Frame
Document Summary
Who do you want to generalize to, what population do you have access to, how do you get access, who is in the study: theoretical population, study population, sampling frame, sample. Limiting the population specify exactly how you will define the population, exactly what population you are interested in. Interrogating external validity: more representative the sample, the better your generalizability. Nonprobability sampling: no estimate of probability of inclusion, no assurance of representative sample. Sampling those who are easy to contact. Sampling those one is able to contact. Diff from limiting because it targets a particular type of person for the purpose of collecting a certain type of data (i. e. , smokers) Known probability for individuals: random sample. Each individual has equal and independent chance to be selected: systematic sample. Increases chance of representative sample: stratified sample. Random sample within subgroups: cluster sample. Randomly select certain # of those groups. Each member in the group (cluster) is included in sample.
