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R Language Interview Questions and Answers

Test your skills through the online practice test: R Language Quiz Online Practice Test

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Ques 1. What is R?

R is a programming language and free software environment for statistical computing and graphics.

Example:

print('Hello, R!')

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Ques 2. How do you assign a value to a variable in R?

You can use the assignment operator <- or =.

Example:

x <- 10

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Ques 3. Explain what a data frame is in R.

A data frame is a two-dimensional, heterogeneous tabular data structure with rows and columns.

Example:

df <- data.frame(Name=c('John', 'Jane'), Age=c(25, 30))

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Ques 4. What is the use of the 'attach()' function in R?

The attach() function is used to attach a data frame to the search path, making it easier to refer to variables in the data frame.

Example:

attach(df)

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Ques 5. How can you install a package in R?

You can use the install.packages() function.

Example:

install.packages('packageName')

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