[R] Plot question

[Marc Schwartz]

On Fri, 2007-12-14 at 08:16 -0500, Alan Barnett wrote:
> I have some data consisting of multiple trials of an experiment with 
> different values of an independent variable.  If I run
> R> plot(var,result)
> I get a scatterplot of result versus the independent variable var.
> If I run
> R> plot(as.factor(var),result)
> I get a boxplot of the distribution of result for each value of var.  In 
> this plot, each boxplot is labeled by the corresponding value of var, 
> but the absissas are evenly spaced.
> Is it possible to generate a boxplot with the absissas of each boxplot 
> equal to the corresponding value of var?

If you want boxplots, you could do something like this:

CV <- rnorm(100)
FV <- sample(c(1, 3, 6), 100, replace = TRUE)

boxplot(CV ~ factor(FV, levels = seq(max(FV))))


This essentially 'fills in' the missing values (levels) of the factor
variable so that they are included in the plot.

HTH,

Marc Schwartz