Getting Your Data into Shape - R Graphics - page 444

include.lowest=TRUE . In this example, this would result in 0 values going into the small cat-
egory; otherwise, 0 would be coded as NA .
If you want the categories to be closed on the left and open on the right, set right = FALSE :

cut(pg$weight, breaks = c( 0 , 5 , 6 , Inf), right = FALSE FALSE )

See Also
To recode a categorical variable to another categorical variable, see Recoding a Categorical Vari-
able to Another Categorical Variable .

Transforming Variables

Problem
You want to transform a variable in a data frame.

Solution
Reference the new column with the $ operator, and assign some values to it. For this example,
we'll use a copy of the heightweight data set:

library(gcookbook) # For the data set
# Make a copy of the data
hw <- heightweight
hw

sex ageYear ageMonth heightIn weightLb
f

11.92 143 56.3 85.0

f 12.92 155 62.3 105.0

...
m

13.92 167 62.0 107.5

m 12.58 151 59.3 87.0

This will convert heightIn to centimeters and store it in a new column, heightCm :

hw$heightCm <- hw$heightIn * 2.54
hw

sex ageYear ageMonth heightIn weightLb heightCm
f

11.92 143 56.3 85.0 143.002

f 12.92 155 62.3 105.0 158.242

...