Программирование R

Задание по программированию на R

Writing on the command windows the function data() it appears a list of pre-loaded datasets. Select data set “mtcars” simply writing its name on the command window (otherwise use the “mtcarsNew.RData” added). Here the variables description:

https://stat.ethz.ch/R-manual/R-devel/library/datasets/html/mtcars.html.

Starting from the whole dataset calculate the mean and the variance of the variable “hp” (gross horsepower) stratified by variable “vs” (Engine (0 = V-shaped, 1 = straight)).

Subset the dataset in two new datasets names “mtcarsA” and “mtcarsB” according to variable “vs”.

Control your previous results calculating the mean and the variance of the variable “hp” (gross horsepower) for the two different datasets. Describe shortly the functions used.