Dot Charts

Standard version

Often it will be advisable to sort data first via mydata <- mydata[order(mydata$var-to-be-sorted-by),].

Now a simple dot chart can be produced by

dotchart(mydata$varname, labels=mydata$varname2, cex=.7, main="Title-for-chart", xlab="Label-for-x-axis")

Note that cex = ... refers to the size of the symbols (relative to the default). It will influence both the dots and the labels.

If mydata has row names (as will typically be the case) and these are to serve as labels, you will write:

dotchart(mydata$varname, labels=row.names(mydata), cex=.7, main="Title-for-chart", xlab="Label-for-x-axis")

The lattice package contains procedure dotplot, which may be outlined in more detail at a later stage.