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Unformatted text preview: Lab 3: Regression Pre-Reading STAT 200 In lab 3, we will investigate the relationship between two quantitative variables using linear regression and use models to make predictions. Objectives Perform a regression analysis. Understand which variable is the response and which the explanatory. Be able to explore relationships graphically. Understand how outliers affect the model fitted. 1. Scatterplots Before fitting a regression model between two variables, we should first explore the relationship graphically. Scatterplots allow us to see many features of the relationship between two quantitative variables. These features are direction, strength, shape and possible presence of outliers. In particular, for the least squares regression line technique covered in this course, we want the shape to be linear. If there is a relationship but it is not linear, then a data transformation could be used to make it linear. Here we will perform a regression analysis using the monkey data used in the pre-reading of Lab 1. In particular, we explore the relationship between...
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This note was uploaded on 10/24/2011 for the course CHEMISTRY chem taught by Professor David during the Spring '11 term at The University of British Columbia.
- Spring '11