Preface to First Edition - lib

86 ANALYSIS OF VARIANCER> interaction.plot(weightgain$type, weightgain$source,+ weightgain$weightgain)mean of weightgain$weightgain80 85 90 95 100weightgain$sourceBeefCerealHighLowweightgain$typeFigure 5.3Interaction plot of type and source.R> coef(aov(weightgain ~ source + type + source:type,+ data = weightgain, contrasts = list(source = contr.sum)))(Intercept) source1 typeLow92.95 7.05 -11.40source1:typeLow-9.405.3.2 Foster Feeding of Rats of Different GenotypeAs in the previous subsection we will begin the analysis of the foster feedingdata in Table 5.2 with a plot of the mean litter weight for the different geno-© 2010 by Taylor and Francis Group, LLC