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correls1 - 031:010 Research Methods in Psychology Spring...

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031:010 - Research Methods in Psychology Spring, 2010 Feb 23 rd 1
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some definitions Experiment (strict) must have at least one manipulated variable (IV) Correlational Study all of the variables are measured - one is treated as the “predicted” variable - the others are treated as the “predictor” variables the difference is important for two reasons - different methods of analysis - different issues for interpretation 2
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some ( more ) definitions middle ground ( between Experiment and Correl Study ) Quasi-Experiment (aka differential design) has a measured variable that is treated as if it had been manipulated - analyzed like a strict experiment - has some of the interpretation problems of a correlational design 3
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Outline Correlations - the good: universal and unit-less - the bad: several limitations - the ugly: alternative interpretations today: the good and the bad; ugly on Thursday 4
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Correlations can be calculated between any two variables when both variables are naturally quantitative (i.e., both are interval or ratio scales; no orders) (e.g., height and respectability ) the “standard” correlation coefficient is used the same goes when one of the variables is dichotomous (i.e., can be coded as
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