PSYCH291 Chapter Notes - Chapter 13: Interrupted Time Series, Fluoride, Repeated Measures Design
16 Dec 2016
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Instead, participants are assigned to the iv conditions by acts of nature or even by their own choice. Can be independent groups (or between groups design) non equivalent control group design (posttest-only) non equivalent control group design (pretest-posttest) Independent groups quasi-experiments: non equivalent control group designs. Used in order to evaluate effectiveness of a treatment program. Two ways in which groups are not the same: groups are not equal at start of study i. e. , not randomly assigned = nonequivalent groups, groups experience different events in study. Look at the change between pretest and posttest. In repeated-measures designs participants experience all levels of an iv. Measures taken on same sample for an extended period and after an event occurs. Where o = points in time , e= events. Allows for examination of patter of behavior over time with reference to event Design allows researcher to rule out alternative explanations of an apparent change from pre- to post-test.
