- What is the difference between a vector and a matrix in R?
- How do you create a scatter plot in R?
- What is the difference between == and = operators in R?
- How do you remove missing values from a data frame in R?
- What is the difference between a factor and a character variable in R?
- How do you find the mean of a vector in R?
- How do you install and load packages in R?
- What is a for loop in R and how is it used?
- How do you use the apply() function in R to apply a function to a data frame?
- How do you select specific columns from a data frame in R?
- What is the difference between a function and a method in R?
- How do you use the readLines() function in R to read in a text file?
- How do you use the sample() function in R to randomly sample from a data frame?
- How do you use the ifelse() function in R to perform conditional operations?
- How do you use the subset() function in R to filter a data frame?
- How do you use the merge() function in R to combine data frames?
- How do you use the which() function in R to find the index of a specific value in a vector?
- How do you use the seq() function in R to generate a sequence of numbers?
- How do you use the grep() function in R to search for a pattern in a string?
- How do you write a for loop to perform a repetitive task in R?
- How do you write a conditional statement using if-else statements in R?
- How do you write a function to perform a specific task in R?
- How do you create a vector in R using the c() function?
- How do you perform arithmetic operations on vectors in R?
- How do you generate random numbers in R using the rnorm() function?
- How do you use the strsplit() function to split a string into substrings in R?
- How do you use the paste() function to concatenate two or more strings in R?
- How do you use the cat() function to print output to the console in R?
- How do you use the write.csv() function to write data to a CSV file in R?
- How do you use the read.csv() function to read data from a CSV file in R?
- How do you use the apply() family of functions to apply a function to a data frame in R?

- What is a list in R and how is it different from a data frame?
- How do you create a boxplot in R and what information does it convey?
- What is the difference between a t-test and a chi-squared test in R?
- How do you create a function in R?
- What is a formula in R and how is it used in linear regression?
- How do you use ggplot2 to create customized plots in R?
- How do you perform a principal component analysis (PCA) in R?
- How do you use the dplyr package to filter, mutate and summarize data in R?
- What is the difference between correlation and covariance in R?
- How do you use the tidyr package to reshape data in R?
- How do you use the lapply() function in R to apply a function to a list of data frames?
- What is the difference between a linear regression and a logistic regression in R?
- How do you use the mapply() function to apply a function to multiple vectors in R?
- How do you use the switch() function to select a statement based on a condition in R?
- How do you use the repeat and break statements to create a loop in R?
- How do you use the tryCatch() function to handle errors in R?
- How do you use the debug() and browser() functions to debug R code?
- How do you use closures and lexical scoping to create functions with persistent state in R?
- How do you use environments in R to manage state and isolate code from the global environment?
- How do you use lazy evaluation and promises in R to improve performance?
- How do you use R's object-oriented programming system to define and work with classes and methods?

- How do you create a Shiny app in R and what are its components?
- How do you use caret to perform machine learning tasks in R?
- How do you use random forests to perform feature selection in R?
- How do you use the nlme package to fit mixed effects models in R?
- How do you use Bayesian statistics in R using the Stan package?
- How do you use the mgcv package to fit generalized additive models in R?
- How do you use the brms package to fit Bayesian regression models in R?
- How do you use the igraph package to visualize and analyze network data in R?
- How do you use the shinydashboard package to create interactive dashboards in R?
- How do you use the caretEnsemble package to combine multiple machine learning models in R?
- How do you use the bigmemory package to handle large data sets in R?
- How do you use R's S4 system for object-oriented programming to define more complex classes and methods?
- How do you use R's reference classes to create mutable objects with shared state?
- How do you use R's function factory mechanism to create and return customized functions?
- How do you use R's higher-order functions to define functions that operate on other functions?
- How do you use R's closures and currying to define functions that take partial arguments?
- How do you use R's apply family of functions to parallelize operations across multiple cores?
- How do you use R's Rcpp package to write high-performance C++ code that can be called from R?
- How do you use R's foreign function interface (FFI) to call code written in other languages from R?
- How do you use R's JIT (Just-In-Time) compiler to improve performance of R code?
- How do you use R's garbage collector to manage memory usage and prevent memory leaks?
- How do you use R's low-level memory management functions to optimize memory usage in R?
- How do you use R's profiler to analyze and optimize R code performance?
- How do you use R's byte compiler to improve performance of R code?
- How do you use R's dynamic loading capabilities to load shared libraries at runtime?
- How do you use R's serialization capabilities to save and load R objects from disk?
- How do you use R's message passing interface (MPI) to enable distributed computing in R?