CODEWITHSUNDEEP
rplotlattice
mushroomfan
mushroomfan

Reputation: 25

Why do xyplot() and dotplot() generate different plots with the same arguments?

Why do the following codes generate different plots? What's the difference between xyplot() and dotplot()?

library(lme4)
library(lattice)
str(Dyestuff)

xyplot(reorder(Batch,Yield)~Yield,Dyestuff,ylab = "Batch", jitter.y = TRUE, pch = 21, aspect = 0.32,
   xlab = "Yield of dyestuff (grams of standard color)",
   type = c("p", "a","g"))

dotplot(reorder(Batch, Yield) ~ Yield, Dyestuff,
          ylab = "Batch", jitter.y = TRUE, pch = 21, aspect = 0.32,
          xlab = "Yield of dyestuff (grams of standard color)",
          type = c("p", "a"))

Upvotes: 1

Views: 65

Answers (1)

Maurits Evers
Maurits Evers

Reputation: 50718

I assume your question refers to the fact that the lines (not points) shown in xyplot and dotplot are different.

enter image description here

This is perhaps not a full answer, but the key to your answer seems is in the documentation to panel.xyplot, panel.dotplot and panel.average.

Specifying type = "a" has the effect of calling panel.average.

It seems that xyplot and dotplot average the data differently. While xyplot averages Batch values per Yield (which is not very meaningful here since Batch is a categorical factor variable), dotplot averages Yield values per Batch.

Upvotes: 1

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