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### R Programming Language: 35 Job Interview Questions and Answers

**1) Explain what is R?**

**2) List out some of the function that R provides?**

- Mean
- Median
- Distribution
- Covariance
- Regression
- Non-linear
- Mixed Effects
- GLM
- GAM. etc.

- You can enter data directly via Data [] New Data Set
- Import data from a plain text (ASCII) or other files (SPSS, Minitab, etc.)
- Read a dataset either by typing the name of the data set or selecting the data set in the dialog box

- Though R programming can easily connect to DBMS is not a database
- R does not consist of any graphical user interface
- Though it connects to Excel/Microsoft Office easily, R language does not provide any spreadsheet view of data

- # subtraction
- # division
- # note order of operations exists

- With() function is similar to DATA in SAS, it applies an expression to a dataset.
- BY() function applies a function to each level of factors. It is similar to BY processing in SAS.

- Vectors
- Matrices
- Arrays
- Data frames

- Data structure -- How many data structures R has? How do you build a binary search tree in R?
- Sorting -- How many sorting algorithms are available? Show me an example in R.
- Low level -- How do you build an R function powered by C?
- String -- How do you implement string operation in R?
- Vectorization -- If you want to do Monte Carlo simulation by R, how do you improve the efficiency?
- Function -- How do you take a function as an argument of another function? What is the apply() function family?
- Threading -- How do you do multi-threading in R?
- Memory limit and database -- What is the memory limit of R? How do you avoid it? How do you use SQL in R?
- Testing -- How do you do testing and debugging in R?
- Software development -- How do you develop a package? How do you do version control?