R Programming Practice Test 6

1. _____________ function is preferred over sapply as vapply allows the programmer to specific the output type.

Lapply

Vapply

Zapply

Japply

2. What will be the output of the following R code?

> nLL <- make.NegLogLik(normals, c(1, FALSE))
> optimize(nLL, c(1e-6, 10))$minimum

empty

1.800596

1.217775

3.73424

3. Point out the correct statement?

"condition" is a generic concept for indicating that something unexpected has occurred

Executing any function in R may result in the condition

All of the mentioned

R has a number of ways to indicate to you that something’s not right

4. _________ package provides basic functionalities in R environment like arithmetic calculations, input/output.

R boost

R base

R serve

R comm

5. __________ function takes various parameters like formula, data, subset, labels, etc.

Cars

Pairs

Pears

Tears

6. What will be the output of the following R code snippet?

> lm <- function(x) { x * x }
> lm

function(x) { x * x }

function(x) { x / x }

func(x) { x * x }

function { x $ x }

7. A ________________ in R programming language can also contain numeric and alphabets along with special characters like dot and underline.

Integer

Variable name

Number

Character

8. ________ applies a function over the margins of an array.

tapply()

mapply()

lapply()

apply()

9. Point out the wrong statement?

You can use tsplit() to evaluate a function single time each with a same argument

apply() can be thought of as a combination of split() and sapply() for vectors only

The sapply() function behaves similarly to lapply()

With multiple factors and many levels, creating an interaction can result in many levels that are empty

10. ______________ function will measure the probability of the binary response variable in R language.

Jlm()

Glm()

Glmi()

Gelmi()