Question

Suppose you have a categorical variable X with nine categories: A, B, C, D, E, F, G, H and I. The frequencies corresponding to these categories are 25, 12, 7, 4, 6, 2, 1, 0, and 2 Consider now X is a vector of these frequencies and give R expressions that return the categories and its corresponding frequencies as below: X A B D E F G I 25 12 7 4 2 1 0 Now you wish to remove the categories and use frequencies only produce a vector containing only frequencies from a vector X as below: as a vector Y. Use R to Y 25 12 7 4 6 2 0 2

Answer 1

We can create our first data set by combining two variables one and two

# Create variables

one=c('A','B','C','D','E','F','G','H','I')
two=c(25,12,7,4,6,2,1,0,2)

#Join the variables to create a data frame

d <- data.frame(one,two)
d

output:

 one two
1   A  25
2   B  12
3   C   7
4   D   4
5   E   6
6   F   2
7   G   1
8   H   0
9   I   2

single bar will perform a vector operation.

both2 = d$two[(d$one=='A') | (d$one=='B')|(d$one=='C') | (d$one=='D')|(d$one=='E') | (d$one=='F')|(d$one=='G') | (d$one=='H')|(d$one=='I')]
y=both2
y

output:

[1] 25 12 7 4 6 2 1 0 2