R Language Basic Questions

The post is about some R Language Basic Questions. The questions are related to the use of R Language, some preliminaries in R, the Use of Rstudio, R Commander, some functions in R, etc.

What is Rstudio and how to use it?

The Rstudio is software used as an editor for writing R and other Language-related programming codes. To use Rstudio, follow the steps:

Step 1: Download and Install Rstudio
Step 2: Open Rstudio
Sep 3: Click on the menu: File -> New -> R Script
Step 4: Paste the R code (write it) in the new source code area. Running the R program on the command line or elsewhere will start the console. One can paste the R code in the R Console or editor area.
Step 5: Click the “Source” button above the code area.

One can also use the console in Rstudio. If a user clicks “Run” instead of “Source” user input might not work properly. One can use the R documentation.

What are Preliminaries in R?

The following are some preliminaries in R Language:

R is a case-sensitive language
# is the comment tag
R is installed with the default library (also called packages). One can add/import extra packages to the library using the command library().
To use a library function one must load it first into the memory using the command load().
Variable names in R language cannot start with “.” (dot), “+” (plus sign), or “=” (minus sign).

Explain What is R

R is a data analysis software that is used by analysts, quants, statisticians, data scientists, and others. R Language is a leading tool for statistics, machine learning, and data analysis. It allows for the easy creation of objects, functions, and packages.

List out some of the functions that the R Language Provides

The following is a short list of functions that R provides:

mean()
median()
var()
lm()
summary()
print()
glm()
plot()

Explain How One Can Start the R Commander GUI

To start the R Commander, type the command, library(Rcmdr) into the R console. Note that one must first install the Rcmdr package.

install.packages("Rcmdr")
# Start the R Commander GUI
library(Rcmdr)

What is R Software for Statistics and Data Analysis

R is an open-source programming language. It is a software environment for statistical computing and graphics techniques. The R language is widely used by statisticians and data miners for developing statistical software/packages and performing data analysis.

What is Mean in R?

The mean is the average of the numbers: a calculated “central” value of a set of numbers. To calculate the mean of a data set, add up all the numbers, then divide by how many numbers there are. In R, one can do this by using the command:

x = c(1, 2, 4, 7, 8, 9, 4, 8)
mean(x)

What is the Median in R?

The Median is the “middle” of a sorted list of numbers. For an even amount of numbers, things are slightly different. In the case of an even number of observations, one can find the middle pair of numbers, and then find the average of these two middlemost numbers. The median can be computed in R by using the command:

x = c(1, 2, 4, 7, 8, 9, 4, 8)
median(x)

Note that R itself decides about a number of observations either there are even or odd number of observations.

Statistics for Data Analysts

R Language Basic Questions