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Correlation and Regression

Correlation and Regression Notes prepared by Pamela Peterson Drake Contents Basic terms and 1. Simple Regression .. 5. Multiple Regression .. 13. Regression terminology .. 20. Regression formulas .. 21. 1 Correlation and Regression Basic terms and concepts 1. A scatter plot is a graphical representation of the relation between two or more variables. In the scatter plot of two variables x and y, each point on the plot is an x-y pair. 2. We use Regression and Correlation to describe the variation in one or more variables.

iii. The correlation coefficient is bound by –1 and +1. The closer the coefficient to –1 or +1, the stronger is the correlation. iv. With the exception of the extremes (that is, r = 1.0 or r = -1), we cannot really talk about the strength of a relationship indicated by the correlation coefficient without a statistical test of significance. v.

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