1. 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 =0.2882 and r=0.5369

2. 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 =0.2882 and r=0.5369 Months of Experience (Standardized) Years of Experience (Standardized) Salary (Standardized)

3. Unit #2/Slide #3 © Judith D. Singer, Harvard Graduate School of Education Revisiting Strength vs. Magnitude OutcomePredictorR2R2 r Salary ($1,000) Experience (Months) 36.8560.082110.28820.5369 Salary ($) Experience (Months) 3685682.110.28820.5369 Salary ($1,000) Experience (Years) 36.8560.82110.28820.5369 Salary ($) Experience (Years) 36856821.10.28820.5369 Experience (Years) Salary ($)-2.4040.000350.28820.5369 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.