Week 6.2 - Sampling & Experiments

Experimental research experimental research

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Unformatted text preview: 1,000) try for 30% Moderate P opulations (around 10,000) try for 10% Large P opulations (over 150,000) try for 1% Non- Probability Samples Haphazard Also called convenience sampling Get any cases in any manner that is convenient Quota Get a preset number of cases in each of several predetermined categories that will reflect the diversity of the population Cases within each category are collected haphazardly Non- Probability Samples Purposive Get all possible cases that fit particular criteria Uses various methods Often used for exploratory research Stop sampling generally when time, money, or other resources are exhausted Snowball Get cases through referral from one or a few cases Then get referrals from those cases … Non- Probability Samples Deviant Case Special type of purposive sample Gather cases that substantially differ from the dominant pattern Sequential Get cases until there is no additional information or new characteristics Often used in conjunction with other methods Hidden Populations Sampling people that are not so visible and accessible Illegal drug users Homeless people Prostitutes Non- probability techniques are often used to study these populations but sometimes com...
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