View source for Gnuplot/C2/Statistics-and-box-plot/English

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|| '''Visual Cue'''
|| '''Narration'''

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|| '''Slide Number 1'''
'''Title Slide '''
|| Welcome to the tutorial on''' Statistics and Box plot'''.

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|| '''Slide Number 2'''
'''Learning Objectives'''
|| In this tutorial, we will 

* Plot string data on x-axis
* Calculate Statistical summary for the input file
* Draw candlestick plot 
* Draw boxplot with outliers and without outliers

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|| '''Slide Number 3'''
'''Learning Objectives'''
|| 
* Specify the position of boxplot on x-axis

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|| '''Slide Number 4'''
'''System and Software Requirement'''
|| To record this tutorial, I am using

* '''Ubuntu Linux''' v 16.04 OS
* '''gnuplot''' v 5.2.6
* '''Gedit''' v 3.18

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|| '''Slide Number 5'''
'''Pre-requisites'''
|| To follow this tutorial, 

* Learner must be familiar with the basics of '''gnuplot'''.
* For pre-requisite '''gnuplot''' tutorials, please visit this site.

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|| '''Slide Number 6'''
'''Code FIles'''
|| The files used in this tutorial are provided in the '''Code files''' link.
Please download and extract them.

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|| Go to '''Desktop'''.
Show file icon '''statistics.txt''' on '''Desktop'''.
|| I have saved the input file on '''Desktop'''.

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|| Screenshot of file opened in '''gedit'''.
|| The input file '''statistics.txt''' consists of 3 columns.

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|| Hover mouse over first column.
House mouse over second column.
Hover mouse over third column.
|| The first column is row number.
The second column is '''y'''-data in frequencies.

The third column is the x data, which has the corresponding string or names.

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|| Press '''Ctrl+Alt+T'''.
|| Open a '''terminal'''. 

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|| Enter the command, '''cd Desktop '''.
|| Change the '''directory''' to '''Desktop'''. 

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|| Enter the command '''gnuplot '''.
|| Let’s open '''gnuplot'''.

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|| Press '''Ctrl+L''' .
|| I will clear the screen.
Let's draw an '''xy''' plot labeling the x axis with strings.

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|| Enter the command, '''set xtics rotate '''.
|| Enter the commands as seen on the screen.
I will rotate the '''x tics labels''' by 90 degrees.

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|| Enter the command, '''set autoscale''' .
|| Use the command '''set autoscale''' to set the axis range to autoscale.

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|| Enter the command, '''plot "statistics.txt" using 2:xticlabels(3)''' .
|| The next command plots the string x data against y to make a 2D plot.

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|| Hover mouse on x tics strings and graph.
|| Notice the graphical plot of '''x string''' data against the numeric '''y axis''' data.
An example of string data is teacher plotting marks against student names.

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|| Cursor on the graphics window.
|| Analysis of such data, often involves, calculation of statistical parameters.

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|| Close the graphics window.
|| Close the graphics window.

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|| Go to the '''terminal'''.
|| Go to the '''terminal''' and type a command as seen on the screen.

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|| Type '''stats "staticstics.txt" using 2 '''and press '''Enter'''.
|| The command '''stats''', filename '''using''' column number, calculates statistics.

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|| Output is seen on the screen.
|| A statistical summary is generated on the screen.

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|| Scroll up the page.
|| Let's scroll up.

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|| Hover mouse over '''61'''.
|| This shows, the file has '''61''' data points.

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|| Hover mouse over '''std dev'''.
Hover mouse over '''Sum'''.
Hover mouse over max and min values.
|| The output shows the statistical summary for the input file.
'''Mean, standard deviation''' & '''sum of squares''' are seen.

'''Minimum''' values & '''maximum''' values are also seen.

'''Median''' and '''quartile range''' is generated on the screen.

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|| Hover mouse next to '''quartile range''' again.
|| We can plot the statistical analysis using candlestick plot or box plot.

This is useful for descriptive or informative analysis.

The height of the box can correspond to either standard deviation or quartile range.

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|| Open '''gedit'''.
|| We will create a datafile to make '''candlestick plot''' with this data.
Open a '''gedit''' window and enter the values as seen here.

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|| Type '''#candlestick plot style''' and start a new line.
|| I will make a comment on the first row.
This Indicates the data is for the candlestick plot style.

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|| Type, 
'''#x-position tab (mean-stddev) tab y-min tab y-max tab (mean+stddev) tab with candlesticks''' .
Press '''Enter'''.
|| I will also include the data format for this plot, with tab separation.

For further information on candlestick plot, use the '''gnuplot''' help section.

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|| Type '''1''', Press '''tab''', type '''300''' .
|| In the next line, enter the values for plotting.
First column is an arbitrary x value.

The candlestick data will be plotted on this x position.

'''300''' is the value of mean minus the standard deviation. 

This defines the lower limit of the box.

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|| Press '''tab''', type''' 119''', press '''tab''', type '''2965'''.
|| '''Y '''minimum in the data is '''119 '''.
The fourth input is the '''y''' max value and it is '''2965''' .

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|| Press '''tab''', type''' 1582'''.
|| Enter the value of mean plus standard deviation as '''1582''' .

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|| '''Save file in Desktop directory'''.
'''Give filename candlestick.dat'''
|| Save the file on '''Desktop''' with the file name '''candlestick.dat''' .

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|| Click on '''save'''.
|| Click on the '''save button''' to save the '''script'''.

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|| Close '''Gedit'''.
|| I will close '''Gedit'''.

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|| Go to '''gnuplot'''.
|| Go back to the '''terminal '''.

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|| Press '''Ctrl+L''' .
|| I will also clear the screen.

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|| Type,
'''set xrange [0.97:1.03]'''
and press '''Enter'''.
|| Let’s also set x axis limits with '''set xrange''' command as seen.

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|| Enter the command, '''plot 'candlestick.dat' using 1:2:3:4:5 with candlesticks''' .
|| Plot the file with the command as seen on the screen.

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|| Cursor on the graphics window.
|| The '''candlestick plot''' appears on the graphics window.
Often, we want to plot, '''outliers''' and '''quartile''' range for box height in the graph.

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|| Close the graphics window.
|| Let us see how to do this.

Close the graphics window.

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|| Enter the command, '''set autoscale''' .
|| In '''gnuplot''' prompt, Set '''autoscale''' for axis range.

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|| Enter the command, '''set style data boxplot'''.
|| Set the box plot style for graph as seen on the screen.
This command, sets the plot style to boxplot.

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|| Enter the command, '''set style boxplot outliers pointtype 7 '''.
|| The next command, plots the boxplot with outliers.

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|| Enter the command, '''set style fill solid 0.5 border -1 '''.
|| Set a solid style color fill for the box.

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|| Enter the command, '''plot 'statistics.txt' using (0):2 ls 1 notitle''' .
|| Type the plot command as seen on the screen.
The plot will be set in '''x''' axis position zero.

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|| Graphics screen shows.
|| In the graph, notice the outliers are also plotted.
Outliers are data points, beyond the '''quartile range''' of the data set.

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|| Type,
'''set style boxplot nooutliers'''
and press '''Enter'''.
|| If the outliers are not to be plotted, do the following.

Go to the gnuplot terminal and enter the command as seen on the screen.

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|| Type
'''replot''' and press '''Enter'''.
|| '''Replot''' to see the results.

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|| Close graph. 
Enter '''q''' to quit '''gnuplot'''
|| Close the graphics window and quit '''gnuplot'''.

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|| '''Slide Number 7'''
'''Summary'''
|| Now let's summarize. 
In this tutorial, we
* Plotted string data on x-axis 
* Calculated statistical summary with '''stats''' command
* Generated candlestick plot
* Generated box plot with and without outliers and 

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|| '''Slide Number 8'''
'''Summary'''
|| * Specified the x-axis position for the box plot

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|| '''Slide Number 9'''
'''Assignment 1'''
[http://gnuplot.sourceforge.net/demo_5.2/ http://gnuplot.sourceforge.net/demo_5.2/]
|| For the assignment activity, please do the following.
Practice box plot with and without outliers for the file '''boxplot.txt'''.

Practice and understand example boxplot styles from '''gnuplot''' website.

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|| '''Slide Number 10'''
'''Assignment 2'''
Draw a time-activity bar chart
|| We will do one more assignment.
* Draw a '''Time-activity graph '''for your daily activities
* For this, time your activities in a day and make a time table. 
* Plot time in hours on y-axis and activities on x-axis.

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|| '''Glimpse of assignment'''.
|| Your assignment may look similar to this.

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|| '''Slide Number 11'''
'''Spoken Tutorial Project'''
|| This video summarises the '''Spoken Tutorial Project'''.
Please download and watch it.

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|| '''Slide Number 12'''
'''Spoken Tutorial workshops'''
|| The '''Spoken Tutorial''' Team 
* conducts workshops and 
* gives certificates. 
For more details, please write to us. 

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|| '''Slide Number 13'''
'''Forum for specific questions:'''
|| Please post your timed queries in the forum.

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|| '''Slide Number 14'''
'''Acknowledgement'''
|| '''Spoken Tutorial Project''' is funded by '''MHRD, Government of India'''.

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|| 
|| This is Rani from '''IIT, Bombay'''. Thank you for joining.
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