I'm confused, hope someone can point out what is not obvious to me.
I thought I was creating a new data frame by 'deleting' rows from an
existing dataframe - I've tried 2 methods.
But this new data frame seems to remember values from its parent - even
though there are no occurences.
Where does it get the values versicolor and virginica from and give then a
count of 0?
What am I missing?
Thanks in advance.
> summary(iris$Species)
setosa versicolor virginica
50 50 50
> nrow(iris)
[1] 150
> iris1 <- iris[iris$Species == 'setosa',]
> nrow(iris1)
[1] 50
> summary(iris1$Species)
setosa versicolor virginica
50 0 0
boxplot(Petal.Width ~ Species, data = iris1, plot=1)
> iris2 <- subset(iris, Species == 'setosa')
> nrow(iris2)
[1] 50
> summary(iris2$Species)
setosa versicolor virginica
50 0 0
> boxplot(Petal.Width ~ Species, data = iris2, plot=1)
--
View this message in context:
http://r.789695.n4.nabble.com/removed-data-is-still-there-tp2548440p2548440.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
