Evaluating Bivariate Normality

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Evaluating Bivariate Normality Social Science Research Design and Statistics, 2/e Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton Evaluating Bivariate Normality PowerPoint Prepared by Alfred P. Rovai IBM® SPSS® Screen Prints Courtesy of International Business Machines Corporation, © International Business Machines Corporation. Presentation © 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Evaluating Univariate Normality Normality refers to the shape of a variable’s distribution. A normally distributed variable represents a continuous probability distribution modeled after the normal or Gaussian distribution, which means it is symmetrical and shaped like a bell-curve. There are three types of normality: univariate, bivariate, and multivariate normality. Bivariate normality indicates that scores on one variable are normally distributed for each value of the other variable, and vice versa. Univariate normality of both variables does not guarantee bivariate normality, but is a necessary requirement for bivariate normality. The primary tool available in SPSS to assist one in evaluating bivariate normality is the scatterplot. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Bivariate Normality The first step in evaluating bivariate normality is to evaluate univariate normality for each variable. If univariate normality is not tenable for either variable, bivariate normality is not tenable. If univariate normality is tenable, the next step is to determine if a circular or symmetric elliptical pattern exists in a bivariate scatterplot. Bivariate normality is tenable if such a pattern exists and if each variable is univariate normal. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Open the dataset Motivation.sav. File available at http://www.watertreepress.com/stats TASK Evaluate bivariate normality for school community and intrinsic motivation. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Follow the menu as indicated. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

List: box. Click the Plots… Move variables School Community and Intrinsic Motivation to the Dependent List: box. Click the Plots… button. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Check the Histogram box and the Normality plots with tests box. Click the Continue button and then the OK button. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

SPSS Output Since N > 50, the Kolmogorov-Smirnov test the the appropriate statistical test to use to evaluate univariate normality. This test evaluates the following two null hypotheses: There is no difference between the distribution of school community data and a normal distribution and there is no difference between the distribution of intrinsic motivation data and a normal distribution. Test results are not significant (i.e., p > .05 for each test), providing evidence to fail to reject each null hypothesis. Consequently, it can be concluded that both school community and intrinsic motivation scores are normally distributed. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Follow the menu as indicated in order to generate a scatterplot using Legacy Dialogs. Alternatively, use Chart Builder. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Click the Simple Scatter icon and then click Define. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

Move the School Community Variable to the Y Axis: box and move the Intrinstic Motivation variable to the X Axis: box (or vice versa). Click OK. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

An approximate symmetric elliptical pattern is displayed by the SPSS Output An approximate symmetric elliptical pattern is displayed by the scatterplot. Therefore bivariate normality is tenable since univariate normality is also tenable for each variable. Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

End of Presentation Copyright 2013 by Alfred P. Rovai, Jason D. Baker, and Michael K. Ponton

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