LinkedIn R

  R Linkedin assessment

How does a matrix differ from a data frame?

• A data frame may contain variables of different lengths.
• A data frame may contain variables that have different modes.
• A matrix must not be singular.
• A matrix may contain numeric values only.

R Linkedin Quiz answers

What value does this statement return?

unclass(as.Date("1971-01-01"))

• 4
• 1
• 365
• 12

R programming Linkedin assessment answers

What do you use to take an object such as a data frame out of the workspace?

• delete()
• erase()
• detach()
• remove()

Linkedin R assessment Quiz answers

Review the following code. What is the result of line 3?

1  xvect<-c(1,2,3)

2 xvect[2] <- "2"

3 xvect

• [1] 7 9
• [1] "1" 2 "3"
• [1] "1" "2" "3"
• [1] 1 2 3

Linkedin R assessment answers

The variable "height" is a numeric vector in the code below. Which statement returns the value 35?

height<-c(25,18,40,45,35)

• height[length[height]]
• height(5)
• height(length(height))
•  height[length(height)]

Linkedin R skill assessment

Linkedin R skill assessment answers

Linkedin R assessment questions

Linkedin R course

R Linkedin learning

Linkedin R badge