[R] Coloring Stripchart Points, or Better, Lattice Equivalent

From: Bryan Hanson <hanson_at_depauw.edu>
Date: Sat, 21 Jun 2008 13:40:45 -0400

Hi All.

I have the commands below to create a stripchart/plot. I was hoping to color the points in the plot by yr, and use a symbol that varied with resp. However, the outcome makes it appear as though the point by point col and pch data is not being passed properly. Any suggestions?

And truthfully, Iıd rather be doing this with Lattice, but Iıve tried several variations of stripplot and canıt even get something with the general layout of the stripchart version.

Thanks, Bryan

Bryan Hanson
Professor of Chemistry & Biochemistry
DePauw University, Greencastle IN USA

index <- round(runif(100, 1, 100))
resp <- rbinom(100, 1, 0.5)
yr <- rep(c("2005", "2006"), 50)
all <- data.frame(index, resp, yr)
for (n in 1:length(all$index)) {

    if (all$yr[n] == 2005) {all$col[n] <- "red"}     else {all$col[n] <- "blue"}

for (n in 1:length(all$index)) {

    if (all$resp[n] == 1) {all$sym[n] <- 1}     else {all$sym[n] <- 3}

stripchart(all$index, method = "stack", ylim = c(0,10), col = all$col, pch = all$sym)

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