I have some data like
A 2 A 4 A 76 B 8 B 13 .. .... Basically, what is the spread of A, B, etc.
What would be a suitable graph to visualize such information in R?
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Best Answer
There are numerous possible displays, depending on what more specifically you want.
One example would be a boxplot for each group (A, B, …) (assuming there are enough values in each group to support one*):
boxplot(len~supp,data=ToothGrowth,horizontal=TRUE,boxwex=.7) 
But you might want to look at histograms, ecdfs, or a number of other possibilities
* Edit: from your later comments, it looks like there's enough data for boxplots.