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  Chapter 5 of \emph{Statistical Models in S}
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  Chapter 5 of \emph{Statistical Models in S}
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  eds J. M. Chambers and T. J. Hastie, Wadsworth \& Brooks/Cole.
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  eds J. M. Chambers and T. J. Hastie, Wadsworth \& Brooks/Cole.
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}
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}
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\examples{
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\examples{
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data(ToothGrowth)
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attach(ToothGrowth)
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attach(ToothGrowth)
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interaction.plot(dose, supp, len, fixed=TRUE)
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interaction.plot(dose, supp, len, fixed=TRUE)
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dose <- ordered(dose)
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dose <- ordered(dose)
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interaction.plot(dose, supp, len, fixed=TRUE, col = 2:3, leg.bty = "o")
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interaction.plot(dose, supp, len, fixed=TRUE, col = 2:3, leg.bty = "o")
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detach()
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detach()
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data(OrchardSprays)
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with(OrchardSprays, {
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with(OrchardSprays, {
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  interaction.plot(treatment, rowpos, decrease)
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  interaction.plot(treatment, rowpos, decrease)
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  interaction.plot(rowpos, treatment, decrease, cex.axis=0.8)
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  interaction.plot(rowpos, treatment, decrease, cex.axis=0.8)
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  ## order the rows by their mean effect
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  ## order the rows by their mean effect
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  rowpos <- factor(rowpos, levels=sort.list(tapply(decrease, rowpos, mean)))
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  rowpos <- factor(rowpos, levels=sort.list(tapply(decrease, rowpos, mean)))
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  interaction.plot(rowpos, treatment, decrease, col = 2:9, lty = 1)
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  interaction.plot(rowpos, treatment, decrease, col = 2:9, lty = 1)
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})
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})
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data(esoph)
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with(esoph, {
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with(esoph, {
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  interaction.plot(agegp, alcgp, ncases/ncontrols)
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  interaction.plot(agegp, alcgp, ncases/ncontrols)
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  interaction.plot(agegp, tobgp, ncases/ncontrols, trace.label="tobacco",
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  interaction.plot(agegp, tobgp, ncases/ncontrols, trace.label="tobacco",
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		   fixed=TRUE, xaxt = "n")
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		   fixed=TRUE, xaxt = "n")
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})
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})