Empty boxplot in R

Question

I am trying to draw boxplots with the following code. When I run it, I get 2 empty boxes, with no plot. It must be something minor, but I can't seem to fix it. Can someone please help.

Sorry, just added the library as 1st line of code.

Here's my code:

library(HSAUR3)   
data(schizophrenia2)

layout(matrix(1:2, nrow =1))
ylim <- range(schizophrenia2$month)
Less <- subset(schizophrenia2, onset == "< 20 Years")
More <- subset(schizophrenia2, onset == "> 20 Years")

boxplot(month ~ disorder, data = Less, ylab = "Month",
    xlab = "Disorder", ylim = ylim, main = "Less than 20")

boxplot(month ~ disorder, data = More, ylab = "Month",
    xlab = "Disorder", ylim = ylim, main = "More than 20")

Where does the schizophrenia2 data come from. We cannot reproduce your code without the data — JRR, Nov 05 '17 at 17:26
@JRR Package `HSAUR`. Found it with `library(sos); findFn("schizophrenia2")`. Package `sos` is a must. — Rui Barradas, Nov 05 '17 at 17:30
This is just a typo. `onset == "< 20 Years"` should in fact be `onset == "< 20 yrs"`. Voting to close as off-topic. — Rui Barradas, Nov 05 '17 at 17:32

score 1 · Accepted Answer · answered Nov 05 '17 at 17:37

1

Less <- subset(schizophrenia2, onset == "< 20 yrs")
More <- subset(schizophrenia2, onset == "> 20 yrs")

answered Nov 05 '17 at 17:37

JRR

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Empty boxplot in R

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