PSYC 2520 Chapter Notes - Chapter 8: Longitudinal Study, The Sequence, Internal Validity
1 Feb 2013
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Document Summary
Beginning behavioral research: a conceptual primer (7th ed. Prospective data - data that will be collected in the future. The challenge is to try to emulate the causal reasoning of mill"s methods (ch. 7) in order to arrive at causal hypotheses that are as sound as possible within the limitations of retrospective data. Exclusion of plausible rival explanations of the covarying relationship between x and y. Nonequivalent-groups designs - a between subjects design in which the sampling units are allocated to the experimental and control groups by means other than randomization. Where o = observation or measurement and x = treatment or intervention. May overcome objections to a randomized design if the objections are based on the ethical cost of depriving control subjects of the benefits of the treatment given to the experimental subjects. Those in group 2 are later given the opportunity to receive the treatment if a beneficial effect is observed.
