search for: veryspeedy

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2008 Mar 07
1
Finding Interaction and main effects contrasts for two-way ANOVA
...contrasts(), se.contrasts() and fit.contrasts() in package gmodels. Given the url for a small dataset and the two-way anova model below, I'd like to reproduce the results from appended SAS code. Thanks. --Dale. ## the dataset (from Montgomery) twoway <- read.table("http://dsteele.veryspeedy.net/sta501/twoway.txt", col.names=c('material', 'temp','voltage'),colClasses=c('factor', 'factor', 'numeric')) ## the model fit <- aov(voltage ~ material*temp, data=twoway) /* SAS code */ proc glm data=twoway; class material temp; model vo...