Thanks for your help Deepayan!

I noticed the other thread before, but I was really looking for a dot plot with error bars. This looks better indeed, as you state yourself in that thread.

The package Hmisc gives the solution through Cbind and xYplot! I will prepare an example graph for the gallery.

Thanks again,

Sander.

library(Hmisc)
# Examples of plotting raw data
dfr <- expand.grid(month=1:12, continent=c('Europe','USA'),
                   sex=c('female','male'))
set.seed(1)
dfr <- upData(dfr,
              y=month/10 + 1*(sex=='female') + 2*(continent=='Europe') +
                runif(48,-.15,.15),
              lower=y - runif(48,.05,.15),
              upper=y + runif(48,.05,.15))

xYplot(Cbind(y,lower,upper) ~ month,subset=sex=='male' & continent=='USA',
       data=dfr)
xYplot(Cbind(y,lower,upper) ~ month|continent, subset=sex=='male',data=dfr)
xYplot(Cbind(y,lower,upper) ~ month|continent, groups=sex, data=dfr); Key()
# add ,label.curves=FALSE to suppress use of labcurve to label curves where
# farthest apart




Deepayan Sarkar wrote:
On Wednesday 04 May 2005 10:30, Sander Oom wrote:
Dear R graphics gurus,

Another question about lattice graphics. This time I would like to plot
means and confidence intervals by group factor in a lattice graph. I can
not find any working lattice examples. Maybe a custom panel function is
the answer, but that is a bit beyond me for now.

There's an example in this thread:

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/50299.html

There might be useful tools in the Hmisc package as well.

The individual plots within the lattice graph could look like this:

# Example with confidence intervals and grid
hh <- t(VADeaths)[, 5:1]
mybarcol <- "gray20"
ci.l <- hh * 0.85
ci.u <- hh * 1.15
mp <- barplot2(hh, beside = TRUE,
        col = c("lightblue", "mistyrose",
                "lightcyan", "lavender"),
        legend = colnames(VADeaths), ylim = c(0, 100),
        main = "Death Rates in Virginia", font.main = 4,
        sub = "Faked 95 percent error bars", col.sub = mybarcol,
        cex.names = 1.5, plot.ci = TRUE, ci.l = ci.l, ci.u = ci.u,
        plot.grid = TRUE)

This gives me

Error: couldn't find function "barplot2"

Maybe you missed a library() call?

Deepayan


mtext(side = 1, at = colMeans(mp), line = -2,
      text = paste("Mean", formatC(colMeans(hh))), col = "red")
box()

Or like this:

data(state)
plotmeans(state.area ~ state.region)

Both plotmeans and barplot2 give interesting options such as printing of
nobs, among other things. In case of a barplot, there should be an
option to plot the confidence intervals in one direction only (up) as to
avoid interference with any black and white shading. The plotMeans
function provides a useful option error.bars ("se", "sd", "conf.int",
"none").

The following test data is still useful:

tmp <- expand.grid(geology = c("Sand","Clay","Silt","Rock"),
  species =
c("ArisDiff","BracSera","CynDact","ElioMuti","EragCurS","EragPseu"),
  dist = seq(1,9,1) )
tmp$height <- rnorm(216)

For instance plotting height versus dist by geology.

Any help very welcome!

Cheers,

Sander.

PS Of course the resulting graph will go to the R graph gallery!

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-- -------------------------------------------- Dr. Sander P. Oom Animal, Plant and Environmental Sciences, University of the Witwatersrand Private Bag 3, Wits 2050, South Africa Tel (work) +27 (0)11 717 64 04 Tel (home) +27 (0)18 297 44 51 Fax +27 (0)18 299 24 64 Email [EMAIL PROTECTED] Web www.oomvanlieshout.net/sander

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