R Statistical Software Basics - Descriptive Statistics - Input Data & Check Number of Data Observations - Head & Tail Functions

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.

Best Practice in R Software, Set the Working Directory, so that we can directly import & export Data files in R.

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")

I have named input variable name as StatMarks so that it will be easy for reading data into the statistical function formulas.

Click Ctrl R or Run or Ctrl plus Enter Tabs

Once You Click u will see the below blue color line R Console

> StatMarks=read.csv("StatisticMarks.csv") To check all the Data Observations StatMarks Type StatMarks in R Console & Click Ctrl R or Run or Ctrl plus Enter Tabs This function will list all the 100 observations in data set. Head Function head( ) This function returns the first six observations in Data head(StatMarks) Click Ctrl R or Run or Ctrl plus Enter Tabs > head(StatMarks)              StatisticsMarks 1             100 2             100 3              99 4              99 5              97 6              97 The first six observations in Data set are 100,100,99,99,97,97. Tail Function tail( ) This function returns the last six observations in Data tail(StatMarks) Click Ctrl R or Run or Ctrl plus Enter Tabs > tail(StatMarks)                         StatisticsMarks 95               49 96               45 97               44 98               35 99               30 100              25 The Last six observations in Data Set are 49,45,44,35,30,25.