SOCIOL 2Z03 Lecture Notes - Lecture 13: Simple Random Sample, Nth Metal, Clinical Trial
9 Apr 2014
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Continued from last lecture march 3rd, 2014. Typology the classification of observations in terms of their attributes on two or more. May be economically conservative but socially liberal, typologies help describe these situations and variation in sample. Help us identify different types of respondents/cases. Rarely are we able to gather information about the entire population. So we need methods to gather a sample. Two types of sampling methods: non-random (non-probability) least likely to be representative of population, random (probability) most likely to be representative, and allow us to estimate population values. Samples are selected in some way not suggested by probability theory. How we select people not based on probability: accidental/convenience choose most convenient subject; self-selected subjects. Call-in polls, surveys on websites, select themselves to take part. Undocumented immigrants population hesitant to be interviewed by officials, how could research build up sample: quota sampling -- selected on basis of characteristics proportionate to their size in population.
