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Chapter 305 Multiple Regression - NCSS

NCSS Statistical Software 305-1 NCSS, LLC. All Rights Reserved. Chapter 305 Multiple Regression Introduction Multiple Regression Analysis refers to a set of techniques for studying the straight-line relationships among two or more variables. Multiple Regression estimates the s in the equation jpjpjjj+x++x+x+y 22110= The X s are the independent variables (IV s). Y is the dependent variable . The subscript j represents the observation (row) number. The s are the unknown Regression coefficients.

Representing Categorical Variables Categorical variables take on only a few unique values. For example, suppose a therapy variable has three possible values: A, B, and C. One question is how to include this variable in the regression model. At first glance, we can convert the letters to numbers by recoding A to 1, B to 2, and C to 3.

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