R Statistical Software Basics – Descriptive Statistics – Arithmetic Mean or Average

The practice sheet titled StatisticMarks Data.csv downloaded from Link. – Download Sheet

About the Data Sheet - The data in this sheet is related to marks scored by 100 Students in a Statistical Test. 

Based on the data, we will use R Software Statistical functions to analyze the descriptive statistics. 

In the Data Sheet, we have Data from A2:A101, A1 being the header of the Data. 

I have stored the StatisticMarks.csv file in Working Directory on my Desktop.

setwd("C:/Users/Rajesh Prabhakar/Desktop/R")

For inputting or reading Data from “StatisticMarks.csv” file, R Command would be

StatMarks=read.csv("StatisticMarks.csv")

Arithmetic mean

The mean, also referred to by statisticians as the average, is the most common statistic used to measure the center of a numerical data set.

The mean is the sum of all the values in the data set divided by the number of values in the data set. 

mean(  )

In the

Data Sheet, we have Data from A2:A101, A1 being the header of the Data titled StatisticsMarks. 

mean(StatMarks$StatisticsMarks)

StatMarks is the name of the variable in which we stored the data followed by $ sign and column header of the Data i.e. StatisticsMarks.

Remember the title of the column should be exactly same including the large caps & small caps or else it will give error.

In R the file names, column headers and row headers should exactly match the same or else the function will give errors

The result of this function in R Console is

> mean(StatMarks$StatisticsMarks)

[1] 73.99