LECTURE NOTES #6: Correlation and Regression
LECTURE NOTES #6: Correlation and Regression6-1Richard GonzalezPsych 613Version (Nov 2021) LECTURE NOTES #6: Correlation and RegressionReading assignment: Stay current with the readingKNNL Chapters 1, 2, 3, 4, and 15; CCWA chapters 1 and 2There are several ways to think about Regression , and we will cover a few of them. Each perspective,or way of thinking about Regression , lends itself to answering different research questions. Usingdifferent perspectives on Regression will show us the generality of the technique, which will help ussolve new types of data analysis problems that we may encounter in our Describing bivariate bivariate normal distribution generalizes the normal distribution.
Lecture Notes #6: Correlation and Regression 6-5 The covariance is similar to the variance except that it is defined over two variables (X and Y) rather than one (Y). We begin with the numerator of the covariance—it is the “sums of squares” of the two variables. Sxy = X (X −X)(Y −Y) (6-4) The (estimated) covariance is Sxy N −1 (6-5)
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