Sakinashaikh at 15:05, 1 June 2020

2020-06-01T15:05:47Z

Sakinashaikh: Created page with "{| border = 1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Plotting bar charts and scatter plot'''. |- || 00:08 || In this tutorial, we will..."

2020-06-01T15:05:12Z

Created page with "{| border = 1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Plotting bar charts and scatter plot'''. |- || 00:08 || In this tutorial, we will..."

New page

{| border = 1
|'''Time'''
|'''Narration'''

|-
|| 00:01
|| Welcome to this tutorial on '''Plotting bar charts and scatter plot'''.

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|| 00:08
|| In this tutorial, we will learn how to:

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|| 00:12
|| Plot '''bar charts'''

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|| 00:14
|| Plot '''scatter plot'''

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|| 00:18
|| Find the correlation coefficient between two objects.

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|| 00:22
|| To understand this tutorial, you should know,

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|| 00:27
|| '''Data frames''' in '''R'''

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|| 00:29
|| Basics of Statistics

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|| 00:33
|| If not, please locate the relevant tutorials '''R''' on this website.

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|| 00:40
|| This tutorial is recorded on

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|| 00:43
|| '''Ubuntu Linux '''OS version '''16.04'''

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|| 00:48
|| '''R''' version '''3.4.4'''

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|| 00:51
|| '''RStudio''' version '''1.1.463'''

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|| 00:57
|| Install '''R''' version '''3.2.0''' or higher.

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|| 01:02
|| For this tutorial, we will use

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|| 01:06
|| A '''data frame moviesData.csv'''

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|| 01:10
|| A '''script''' file '''barPlots.R'''.

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|| 01:15
|| Please download these files from the '''Code files''' link of this tutorial.

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|| 01:21
|| I have downloaded and moved these files to '''Plots''' folder.

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|| 01:28
|| This folder is located in '''myProject''' folder on my '''Desktop'''.

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|| 01:33
|| I have also set '''Plots''' folder as my '''Working Directory.'''

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|| 01:40
|| Let us switch to '''Rstudio'''.

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|| 01:42
|| Open the '''script barPlots.R '''in''' RStudio'''.

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|| 01:49
|| Run this '''script''' by clicking on '''Source''' button.

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|| 01:53
|| '''movies data frame''' opens in the '''Source''' window.

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|| 01:58
|| It has 600 '''observations''' of 31 '''variables'''.

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|| 02:04
|| In the '''Source''' window, scroll from left to right.

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|| 02:10
|| This will enable us to see the remaining objects of '''movies data frame'''.

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|| 02:17
|| Now, we will learn how to draw a bar chart of the object named '''imdb underscore rating''' in '''movies'''.

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|| 02:27
|| A '''bar chart '''represents data in rectangular bars with length of the bar proportional to the value of the '''variable'''.

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|| 02:37
|| '''R''' uses the '''function barplot''' to create bar charts.

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|| 02:42
|| Let us switch to '''RStudio'''.

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|| 02:45
|| For the sake of simplicity, we are considering only the first 20 '''observations''' of '''movies''' to draw a bar chart.

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|| 02:54
|| Click on the '''script barPlots.R'''

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|| 02:58
|| In the '''Source''' window, type the following '''command'''.

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|| 03:02
|| Save the '''script''' and run the current line by pressing '''Ctrl + Enter''' keys simultaneously.

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|| 03:11
|| Let me resize the '''Source''' window.

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|| 03:14
|| '''moviesSub''' with 20 '''observations''' is loaded in the '''Environment'''.

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|| 03:21
|| Now, we draw a bar chart of '''imdb_rating''' for these movies.

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|| 03:28
|| In the '''Source''' window, type the following '''command'''.

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|| 03:34
|| Here, we have used the following '''arguments''':

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|| 03:39
|| '''moviesSub dollar sign imdb underscore rating '''is the data for plotting

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|| 03:46
|| '''ylab''' and '''xlab''' for adding labels to the respective axes.

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|| 03:53
|| '''col''' to set the color of bins

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|| 03:57
|| '''ylim''' to set the range of values on Y-axis

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|| 04:02
|| '''main''' for adding a title to the bar chart.

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|| 04:07
|| Run the current line.

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|| 04:09
|| The bar chart is displayed with '''Movies''' on X-axis and their '''imdb_rating''' on Y-axis.

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|| 04:18
|| In the '''Plots''' window, click on '''Zoom''' to maximize the plot.

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|| 04:23
|| This particular movie has an '''IMDB rating''' of approximately 6.

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|| 04:31
|| Similarly, this particular movie has an '''IMDB rating''' of approximately 8.

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|| 04:39
|| However, we do not know the name of the movies.

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|| 04:44
|| So, we will add more '''arguments''' in '''barplot function''' to show the names of movies on X-axis.

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|| 04:52
|| Close this plot.

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|| 04:55
|| In the '''Source''' window, type the following '''command'''.

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|| 05:00
|| Here, we have used the '''argument names.arg''' and set it to '''title'''.

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|| 05:06
|| Remember, '''title''' column in '''moviesSub''' contains the names of movies.

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|| 05:13
|| Run the current line.

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|| 05:16
|| In the '''Plots''' window, click on '''Zoom''' to maximize the plot.

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|| 05:22
|| Now, the names of movies are displayed on the X-axis.

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|| 05:27
|| But not for all movies.

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|| 05:30
|| This is due to the point that the names are too long to be accommodated.

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|| 05:36
|| That’s why, we will make these names perpendicular to X-axis.

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|| 05:42
|| Close this plot.

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|| 05:44
|| In the '''Source''' window, type the following '''command'''.

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|| 05:49
|| Here, we have used '''las argument'''.

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|| 05:53
|| '''las '''equal to''' 2''' produces labels which are at right angles to the axis.

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|| 06:01
|| Run the current line.

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|| 06:03
|| In the '''Plots''' window, click on '''Zoom''' to maximize the plot.

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|| 06:10
|| Now the names for all the movies are displayed on X-axis.

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|| 06:15
|| For example, '''Filly Brown''' has an '''IMDB rating''' of approximately 6.

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|| 06:23
|| However, longer names are being truncated.

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|| 06:28
|| We can add more '''arguments''' to '''barplot function''' for adjusting labels.

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|| 06:34
|| For more information, please refer to the '''Additional Material''' section on this website.

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|| 06:42
|| Close this plot.

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|| 06:44
|| In the '''Source''' window, click on '''movies'''.

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|| 06:47
|| Let us analyze the relation between '''imdb underscore rating'''

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|| 06:54
|| and '''audience underscore score'''.

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|| 06:58
|| For this, we will draw a '''scatter plot''' with these two objects by using '''plot function'''.

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|| 07:05
|| Remember, we have already learnt how to plot a single object.

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|| 07:11
|| '''Scatter plot''' is a graph in which the values of two '''variables''' are plotted along two axes.

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|| 07:18
|| The pattern of the resulting points reveals the correlation.

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|| 07:24
|| Let us switch to '''RStudio'''.

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|| 07:27
|| In the '''Source''' window, click on the '''script barPlots.R'''

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|| 07:32
|| In the '''Source''' window, type the following '''command'''.

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|| 07:39
|| Here, we have kept '''imdb underscore rating''' on the X-axis and '''audience underscore score''' on the Y-axis.

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|| 07:50
|| As '''imdb underscore rating''' of any movie varies between 0 and 10,

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|| 07:56
|| we have set the range of values on X-axis from 0 to 10.

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|| 08:02
|| Similarly, we have set the range of values on Y-axis from 0 to 100.
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|| 08:08
|| Save the '''script''' and run the current line.

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|| 08:13
|| In the '''Plots''' window, click on '''Zoom''' to maximize the plot.

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|| 08:18
|| We can observe that the movies having higher '''imdb underscore rating''' has a high '''audience underscore score'''.

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|| 08:28
|| Close this plot.

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|| 08:31
|| Now we will learn how to calculate the correlation coefficient between '''imdb underscore rating '''and '''audience underscore score'''.

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|| 08:42
|| For this, we use '''cor function'''.

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|| 08:46
|| In the '''Source''' window, type the following '''command'''.

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|| 08:50
|| Save the '''script''' and run the current line.

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|| 08:55
|| The correlation coefficient between '''imdb underscore rating''' and '''audience underscore score''' is evaluated as 0.865.

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|| 09:08
|| The value of correlation coefficient is always between -1 and +1.

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|| 09:15
|| A positive value indicates that the '''variables''' are positively related.

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|| 09:21
|| Let us summarize what we have learnt.

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|| 09:25
|| In this tutorial, we have learnt how to:

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|| 09:29
|| Plot '''bar charts'''

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|| 09:31
|| Plot '''scatter plot'''

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|| 09:34
|| Find the correlation coefficient between two objects

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|| 09:39
|| We now suggest an assignment.

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|| 09:43
|| Read the file '''moviesData.csv'''.

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|| 09:48
|| Create a bar chart of '''critics underscore score''' for the first 10 movies.

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|| 09:55
|| Create a '''scatter plot''' of''' imdb underscore rating''' and '''imdb underscore num underscore votes''' to see their relation.

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|| 10:08
|| Save both the plots.

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|| 10:11
|| The video at the following link summarises the Spoken Tutorial project.

|-
|| 10:19
|| We conduct workshops using Spoken Tutorials and give certificates.

|-
|| 10:24
|| Please contact us.

|-
|| 10:27
|| Please post your timed queries in this forum.

|-
|| 10:31
|| Please post your general queries in this forum.

|-
|| 10:35
|| The '''FOSSEE '''team coordinates the '''TBC '''project.

|-
|| 10:40
|| For more details, please visit these sites.

|-
|| 10:43
|| The Spoken Tutorial project is funded by '''NMEICT''', '''MHRD''', Govt. of India

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|| 10:50
|| The script for this tutorial was contributed by Tushar Bajaj (TISS Mumbai).

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|| 10:58
|| This is Sudhakar Kumar from IIT Bombay signing off. Thanks for watching.

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|}

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 || Please contact us.
 |-

R/C2/Plotting-Bar-Charts-and-Scatter-Plot/English-timed - Revision history

Sakinashaikh at 15:05, 1 June 2020

Sakinashaikh: Created page with "{| border = 1 |'''Time''' |'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Plotting bar charts and scatter plot'''. |- || 00:08 || In this tutorial, we will..."