SOCI 2030 Lecture Notes - Lecture 7: Simple Random Sample, Snowball Sampling, Alf Landon
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A brief history of sampling: (cid:498)president(cid:499) alf landon: poll results: alf landon 57%; roosevelt 43% election results: roosevelt 61% Answer: the sample should have been chosen from the u. s. population as a whole, not just from those wealthy enough to have phones and cars in that struggling economy. Having a telephone or a car at that time was very rare, and only the rich had them. However, it used the 1940 census and a lot of people had moved to cities. **thomas dewey vs. harry truman: but, this is a nonprobability sample (quota sampling a probability sample) Non-probability sampling: reliance on available subjects sampling, purposive (judgmental) sampling, snowball sampling, quota sampling, selecting informants. Probability sampling: epseem (equal probability of selection. Method: simple random sampling, pps (probability proportionate to size, systematic sampling, stratified, cluster, any technique in which samples are selected in some fashion not suggested by probability theory.
