Question

Please help answer this question using R.
Data sets are provided by putting in R.

(will rate if answered by Tues 6/18)

5. 5.1 For the UScereal (MASS) data set, create a scatter plot of calories modeled by sugars using the shelf variable to create different plot characters. Add a legend to indicate the shelf number. Is there any pattern?

Answer 1

R codes:

  
library(MASS)
attach(UScereal)

plot(sugars[shelf==1],calories[shelf==1],col=1,xlab='sugars', ylab='calories')
points(sugars[shelf==2],calories[shelf==2],col=2)
points(sugars[shelf==3],calories[shelf==3],col=3)
legend(x=12,y=95,c('shelf=1','shelf=2','shelf=3'),col=c(1,2,3),pch=c(1,1,1))

R output :

o shelf shelf 2 o shelf-3 O O 0 5 10 15 sugars calories 120 130 140 06 00 O

Values corresponding to shelf =1 which have low sugars,have low calories .

Values corresponding to shelf=2, have both high values of sugars and calories

Values corresponding to shelf=3, have low values of sugar with high calorie values. There are a few outliers in this regard.