Unit #2/Slide #1 © Judith D. Singer, Harvard Graduate School of Education Revisiting Strength vs. Magnitude The correlation coefficient is a measure of.

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Unit #2/Slide #1 © Judith D. Singer, Harvard Graduate School of Education Revisiting Strength vs. Magnitude The correlation coefficient is a measure of the STRENGTH of the relationship between the initial (non-standardized) variables. R 2 = and r=0.5369

Unit #2/Slide #2 © Judith D. Singer, Harvard Graduate School of Education Revisiting Strength vs. Magnitude With STANDARDIZED variables, the scales of the initial variables do not matter. Standardization eliminates the particular metrics of the original scales. R 2 = and r= Months of Experience (Standardized) Years of Experience (Standardized) Salary (Standardized)

Unit #2/Slide #3 © Judith D. Singer, Harvard Graduate School of Education Revisiting Strength vs. Magnitude OutcomePredictorR2R2 r Salary ($1,000) Experience (Months) Salary ($) Experience (Months) Salary ($1,000) Experience (Years) Salary ($) Experience (Years) Experience (Years) Salary ($) Unlike other measures, r and R 2 do not depend on the scaling of the outcome and predictor, or even on which variable is the outcome or the predictor.