PSYC 2001 Lecture Notes - Lecture 17: Pearson Product-Moment Correlation Coefficient, Correlation And Dependence, Mantra
17 Nov 2015
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Purpose of correlational research: to establish that relation exists b/w variables & to describe nature of this relationship: rubin"s (1970) love scale & being in love , reliability coefficient is . 87 to 1. 0 (bowker et al. , 2009) Pearson correlation (r) coefficient: statistic that indicates degree to which 2 variables are related to 1 another in a linear fashion. Range r: b/w 1. 00 & + 1. 00. When multiple correlations are used, results are typically shown in correlation matrix. Consider (theoretical) relationship b/w grades, iq, and hours of study: *chart in lecture slide* Remember our mantra: correlation does not imply causality! Correlational studies don"t allow us to determine which variable is the cause & which variable is the effect. E. g. , experience or a need for achievement -> estimated grade (academic achievement) Although correlational study may establish that 2 variables are related, it doesn"t necessarily mean that there is a direct relationship b/w them.
