R help - Jan 2011 - boxplot - how to supress groups with low counts

In a boxplot - how can I prevent groups where the number of cases is less
than a set threshold from being plotted.

set.seed(42)
 DF <- data.frame(type=sample(LETTERS[1:5], 100, replace=TRUE),
cost=rnorm(100)) 
 count <- boxplot(cost ~ type, data=DF, plot = 0) 
 count$n

## how to only include plots where count$n > 18   
 boxplot(cost ~ type, data=DF)   

Thanks in advance for any solutions.
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On 28.01.2011 14:21, pdb wrote:
>
> In a boxplot - how can I prevent groups where the number of cases is less
> than a set threshold from being plotted.
>
> set.seed(42)
>   DF<- data.frame(type=sample(LETTERS[1:5], 100, replace=TRUE),
> cost=rnorm(100))
>   count<- boxplot(cost ~ type, data=DF, plot = 0)
>   count$n
>
> ## how to only include plots where count$n>  18
>   boxplot(cost ~ type, data=DF)
>
> Thanks in advance for any solutions.
set.seed(42)
DF <- data.frame(type = sample(LETTERS[1:5], 100, replace=TRUE),
                  cost = rnorm(100))
count <- boxplot(cost ~ type, data=DF, plot = 0)
for(i in c(1,3)) count[[i]] <- count[[i]][,count$n > 18]
for(i in c(6,2)) count[[i]] <- count[[i]][count$n > 18]
bxp(count)

Uwe Ligges