about boxplots in R

[lily li]

Hi ggplot users,

I'm trying to plot boxplots, but have some problems. The data frame is like this:

df

year    month    flow

1990      1          10

1990      2          13

1990      3          20

...

2010     12         14

box1 = ggplot(subset(df, year %in% c(1995:2010), aes(x=month, y=flow)+

     geom_boxplot()+ xlab('Months')+ ylab('Flow (mm/month))

print(box1)

But then it shows the error:

Warning message:

Continuous x aesthetic -- did you forget aes(group=...)? 

I really can't check out any problem. Thanks for your help.

[eipi10]

month is a number, so ggplot treats it as a continuous variable. Change to x=factor(month) and ggplot will then treat each month as a categorical variable.

[lily li]

Thanks, it solved the problem. I didn't know where to check out.

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[Hadley Wickham]

The error message also gives a hint ;)

ggplot(subset(df, year %in% c(1995:2010), aes(month, flow) +
geom_boxplot(aes(group = month)) +
xlab('Months') +
ylab('Flow (mm/month))

Hadley

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