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

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Unformatted text preview: 031:010 - Research Methods in Psychology – Spring, 2010 – Feb 23 rd 1 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 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 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 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 dichotomous (i....
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This note was uploaded on 04/29/2010 for the course PSYCH 002 taught by Professor Freeman during the Spring '08 term at University of Iowa.

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

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