Question

Need help inputting into R Studio to get answer

QUESTION 1 How can you find the column names in the dataset named "juul2"? QUESTION 1B How would you find the number of rows in the age column of the juul2 dataset? QUESTION 1C How would you identify the number of entries in the age column of the juul2 dataset that are listed as "NA"? QUESTION 1D How would you create a 4x5 matrix from the sequence of numbers going from 10 to 105 (inclusive) by 5's? Have the values going into the matrix by rows.

Answer 1

Run following commands in R

1)

data = read.csv(file='juul2.csv', header=T, sep=',') # This is for csv file

str(data) # Initially Convert to string

colnames( data ) # It gives the column names

1.B)

nrow(data$age) # Gives no of rows in column age

1.C)

sum(is.na(data$age)) # Gives total no of NA in age column

1.D)

x= seq(10,105,5)

matrix(x,nrow = 4, ncol= 5 , byrow = "true")