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4-sample design

# 4-sample design - Alist,,ofelementsinthe population list(s...

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8/2/2013 1 4. Sampling Design 1 There are three basic features for sample selection in a careful designed survey: A list, or combinations of lists, of elements in the population. Chance or random selection of elements from the list(s) list(s). (?) Some mechanism that assures that key subgroups of the population are represented in the sample. 2 Probability Sample When each element in the frame is assigned a known and nonzero chance to be chosen. Note that these probabilities need not be equal. 3 Types of Non probability Sampling Haphazard Collections Judgment Sampling Quota Sampling Expert Sampling 4 Haphazard Collections These are samples made up of individuals ll i l il bl h casually met or conveniently available, such as students enrolled in a class or people passing by on a street corner 5 Judgment Sampling Sample elements are chosen from the l i b i i i h i population by interviewers using their own discretion about which informants are “typical” or “representative 6

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