14nov2011 - CR Long C532: Regression Modeling 14 Nov 2011...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CR Long C532: Regression Modeling 14 Nov 2011 1 Learning Objectives 1. Use the SPSS general linear model procedure to analyze data under the ANCOVA model 2. Reporting standards for ANCOVA Assessing assumption that the relationship between Y and X (the covariate) is parallel between treatment groups: add an interaction term between y and x to the model. ANOVA Table for ANCOVA: Source of variation df SS MS Test-statistic Covariate 1 SS x SS x MS x / MS error Between group k-1 SS BG|x SS B|x /(k-1) MS BG|x / MS error (adjusted for covariate) Covariate*group 1*(k-1) SS interaction SS int /(k-1) MS interaction / MS error Error (adjusted) n-k-1-(k-1) SS error SS error /(n-k-1) Total n-1 SS Total 1. ANOVA model represented as a multiple linear regression model i j i j i i i X X X Y ) 1 ( ) 1 ( 2 2 1 1 0 ... , where 1 X , 2 X ,…, 1 j X represent j- 1 new dummy variables defining the explanatory variable that is the nominal categorical treatment group variable with
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/03/2012 for the course C 532 taught by Professor Long during the Fall '11 term at Palmer Chiropractic.

Page1 / 2

14nov2011 - CR Long C532: Regression Modeling 14 Nov 2011...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online