Statistical Sciences 1024A/B Lecture Notes - Lecture 1: Response Bias, Statistical Parameter, Statistic

• School: Western University
• Department: Statistical Sciences
• Course: Statistical Sciences 1024A/B
• Professor: Devan Becker

Document Summary

Population: the group that you are interest in. Sample: all of the units that you have data for. Statistic: any number that is calculated from a sample. Parameter: any that is calculation from a population. **there isn"t always a population parameter that corresponds to the sample statistic** Cluster samples : take all of some of the groups. Strati ed samples; take some of all of the groups. Multistage samples: take some of some groups - used when there are too many groups. Simple random sample (srs): all possible samples are equally likely. A b c d e f. want a sample of 3 units. Choose 2 from a b c d and 1 from e f. All units have 50/50 chance of being selected, never a b c. All units have the same chance of being selected, not srs. Srs is used with replacement to keep probability even. Non response bias: problem with the sampling - systematic lack of response.