Hi
I have the following barchart to which I want to add error bars.

    library(lattice)
    barchart(Change~fTreat,groups=Process,change,
              auto.key=list(points=FALSE,rectangles=TRUE),
              panel=function(x, y,...){
                panel.barchart(x,y,origin = 0,...);
                panel.abline(h=0,col="black",...);
                }
              )

I have tried using the panel.errbars from the memisc package which works great for xyplots, but when I add it to my code it does not respect the groups.

    library(memisc)
    barchart(cbind(Change,lower,upper)~fTreat,groups=Process,change,
         ylab="Pocertage change",
         ylim=-115:50,
         scales=list(alternating=FALSE,
                     tick.number=7,
                     tck=c(-1,0)),
         panel=function(x, y,groups,...){
           panel.barchart(x,y=change$Change,groups=change$Process,origin = 0,...);
           panel.abline(h=0,col="black",...);
           panel.errbars(x,y,make.grid="none",ewidth=0.2,type="n",...)
         }
         )

Any ideas of how to add error bars to my plot either using the panel.errbars or any other function?

The data:

        structure(list(Treat = structure(c(3L, 4L, 1L, 2L, 3L, 4L, 1L,
    2L), .Label = c("12-380", "12-750", "8-380", "8-750"), class = "factor"),
        Process = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L), .Label = c("Resp",
        "Cal"), class = c("ordered", "factor")), Change = c(-33.05,
        -34.74, 20.94, 18.06, 6.85, -28.57, -8.1, -78.72), upper = c(-13.22896628,
        -28.61149669, 31.29930461, 27.30173776, 39.73271282, 9.458372948,
        13.11035572, -47.03745704), lower = c(-52.86120694, -40.87446411,
        10.57421563, 8.822042178, -26.03144161, -66.60447035, -29.30563327,
        -110.3973761), fTreat = structure(c(1L, 2L, 3L, 4L, 1L, 2L,
        3L, 4L), .Label = c("8-380", "8-750", "12-380", "12-750"), class = c("ordered",
        "factor"))), .Names = c("Treat", "Process", "Change", "upper",
    "lower", "fTreat"), row.names = c(NA, -8L), class = "data.frame")

Regards

Beatriz de Francisco Mora
PhD Student
The Scottish Association for Marine Science
Scottish Marine Institute
Oban
PA37 1QA
Tel: 06131 559000 (switchboard)
Fax: 01631559001
E. beatriz.defrancisco@sams.ac.uk<mailto:beatriz.defrancisco@sams.ac.uk>
http://www.smi.ac.uk/beatriz-de-franciso

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