CODEWITHSUNDEEP
rboxplot
Petrroll
Petrroll

Reputation: 761

Boxplot sees values that aren't there

I have a IMDB dataset and trying to make a boxplot of a film's ratings.

I've successfully loaded the dataset and tried to make the boxplot but it produced a really weird result.

It looked as it tried to make a boxplot for all the films and not just the one selected.

boxplot(rating ~ title, data=imdb[imdb$title == "Top Gun (1986)", ])

The graph produced: enter image description here

As you can see the y axis looks as if it contained films that aren't in the filtered dataset at all (I selected those via title).

Upvotes: 0

Views: 51

Answers (1)

blmoore
blmoore

Reputation: 1487

Factors retain their levels even after subsetting, you can drop those that are unused with droplevels:

boxplot(rating ~ title, data=droplevels(imdb[imdb$title == "Top Gun (1986)", ]))

Upvotes: 1

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