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Hello friends and welcome to the tutorial on 'Statistics' using Python.

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At the end of this tutorial,you will be able to, Do statistical operations in Python Sum a set of numbers Find their mean,median and standard deviation

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Before beginning this tutorial,we would suggest you to complete the tutorial on

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"Loading Data from files" "Getting started with Lists" and "Accessing Pieces of Arrays".

accessing pieces of arrays terminal type sega ipython space hyphen pylab in the

Now, type in terminal ipython space hyphen pylab.

tutorial in um find product um data file in the path yield another slash home slash fossee slash sslc2 dot txt

For this tutorial, we will use data file that is at the path slash home slash fossee slash sslc2 dot txt.

adil war estate secondary board examination is mana burgle in Salford

It contains record of students and their performance in one of the State Secondary Board Examination.

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It has 180,000 lines of record.

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We are going to read it and process this data.

Wyndham file in content I are they

We can see the content of the file by double clicking on it.

double-click say the column are the makeup area file appear paddle terrific

It might take some time to open since it is quite a large file.

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Please don't edit the data since it has a particular structure.

data away year it's a logical Adele rock repeater structure here

To check the contents of the file, we use the cat command.

karada file in content I Adele cat command a year key column cat space slash home slash fossee slash sslc2 dot txt enter faker

So type cat space slash home slash fossee slash sslc2 dot txt and Hit enter.

file in waterbury semicolon calipari capita padeen or fill the kaluana

Each line in the file is a set of 11 fields separated by semi-colons.

in the final gear on the worry sample very a power angle yay semicolon 0 1 5 1 6 3 semicolon joseph raj yes semicolon 0 8 3 semicolon 0 4 2 semicolon for seven

Consider a sample line from this file. A semicolon 015163 semicolon JOSEPH RAJ S semicolon 083 semicolon 042 semicolon 47 semicolon 00 semicolon 72 semicolon 244 and three semicolons in a row.

semicolon double 0 semicolon 7 2 semicolon to double for Mirjam barista yoga mantra semicolon galue Lana

Reuben away Ella very Kelly loom Phil the Galaga will Lana region code in je daii a roll number zero one five one six three named joseph raj s i in the

The following are the fields in any given line. * Region Code which is 'A' * Roll Number 015163 * Name JOSEPH RAJ S * Marks of 5 subjects: ** English 083 ** Hindi 042 ** Maths 47 ** Science 35 **Social Science 72 and Total marks 244

subject Colonel marks English eighty-three Hindi forty-two max forty-seven science thirty-five social science seventy too much room total

marks 244 in the data by were array

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Lets load this data as an array and then run various functions on it.

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To get the data as an array, we use the loadtxt command

terminal types acre yell is equal to within brackets in single quotes slash home slash fossee slash sslc2 dot txt comma usecols is equal to within

So type on the terminal L is equal to loadtxt within brackets , single quotes slash home slash fossee slash sslc2 dot txt comma usecols is equal to within brackets 3,4,5,6,7 comma delimiter is equal to within single quotes semicolon) and hit Enter.

brackets 3 comma 4 comma 5 comma 6 comma 7 comma delimiter is equal to within single quotes semicolon pin enter shaker

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We get our output in the form of an array dot loadtxt function.

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Now we got an error. We have to type loadtxt before the brackets.

character Jana creeper grader pion productive end here column gal I used calls creeper a graders are the way

Delimiter specifies the kind of character, that the fields of data separated by usecols specifies the columns to be used.

within brackets 3 comma 4 comma 5 comma 6 comma 7 in the column collider

So within brackets 3,4,5,6,7 loads those columns.

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The 'comma' is added because usecols is a sequence.

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As we can see L is an array.

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We can get the shape of this array using in the terminal we can type L dot shape and hit Enter.

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We get a tuple stating the numbers of rows and columns respectively.

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Lets start applying statistical operations on these.

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We will start with the most basic, summing.

Moodle student Ella subject column Hwang Geum are googling Mota they can

How do you find the sum of marks of all subjects for the first student.

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As we know from our knowledge of accessing pieces of arrays, to access the first row, we will do in terminal type L square brackets 0 comma colon.

for the Dakota Nam every soul alums total marks is equal to some within brackets yell within square brackets 0 comma colon pin enter Seca pin total MUX

Now to sum this we can say total marks is equal to sum within brackets L within square brackets 0 comma colon and Hit Enter.Then total marks. Then again Enter.

pin enter faker you for the mean akin to

Pelican um total marks a lentil burger

Now to get the mean we can divide the total marks by the length.

column are the way types acre total marks slash Len within brackets yell in square brackets 0 comma colon Allah the

So type total marks slash len within brackets L in square brackets 0 comma colon.

yella Daaga function mean a pine forest

Or simply use the function mean.

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For that type mean within brackets L and in square brackets 0 comma colon and hit Enter.

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But we have such a large data set and calculating the mean of each student one by one is impossible.

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Is there a way to reduce the work.

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For this we will look into the documentation of mean So for that type mean question mark in the terminal.

mother guru two dimensional array num

As we know L is a two dimensional array.

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We can calculate the mean across each of the axis of the array.

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The axis of rows is referred by number 0 and columns by 1.

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So to calculate mean across all columns, we will pass extra parameter 1 for the axis.

coudl parameter 1j a chick cuckoo column agave type ii mean within brackets L comma one pin enter SATA yelling J root

So type mean within brackets L comma 1 and hit Enter.

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L here, is a two dimensional array.

subject Illume yell Aman over column Bankia mark in average connected I mean within brackets L comma 0 by PI n for the column added this num elem honorable

Similarly to calculate average marks scored by all the students for each subject can be calculated using mean within brackets L comma 0. Next, let us calculate the median of English marks for the all the students.

goloka mana english mark google in

midian eikan-do Pitta column yell in square brackets colon comma 0 pin enter Seca me DNA para num function median a PI n for Salam Agha wait type Sega

We can access English marks of all students using L in square brackets colon comma zero and hit Enter. To get the median we will simply use the function median. So type median within brackets L square brackets colon comma 0 .

median within brackets L in square brackets colon comma 0

yellow subject color kunam is a syntax I mean I can do pericope inferred column merge from median a pion policy yell

For all the subjects we can use the same syntax as mean and calculate median across all rows using median

LaRocca lock imperial median am Canterbury column median in brackets L

So type median in brackets L comma 0 and hit Enter.

comma 0 pin enter Sega are they polar English sugar standard deviation a

Similarly to calculate standard deviation for English we will use the function std

conduit occur num function STD a pion for column STD in brackets L in square brackets colon comma 0 pin enter sake up much

So type std, in brackets L and in square brackets colon comma 0 and hit Enter

room yella row column num STD within brackets L comma 0 CL um video way in

and for all rows, we do std within brackets L comma 0.

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Pause the video here, try out the following exercise and resume the video.

slash home slash fossee slash football dot txt in Kolkata file football dot txt for column player named yonder body goes at home Mancha weather goes away vocaroo

In the given file football dot txt at path slash home slash fossee slash football dot txt , one column is player name,second is goals at home and third goals away.

player to come total goals I can do pretty kaboom home much room away goals

1.Find the total goals for each player

will mean home Mirjam away goals in

2.Mean of home and away goals

standard deviation either avianna data

3.Standard deviation of home and away goals

either KU football dot txt file Akira

This is the required data.

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For that open the football dot txt file.

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The solution is on your screen.

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This brings us to the end of the tutorial. In this tutorial,we have learnt to,

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1. Do the standard statistical operations sum , mean median and standard deviation in Python. 2. Combine text loading and the statistical operation to solve real world problems.

operation girl a real world problem Galactica combined Fadel tier Buchanan's

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Here are some self assessment questions for you to solve

two dimensional list capitalist to underscore dimensional underscore list is equal to within square brackets 3 comma 5 comma 8 comma

1. Given a two dimensional list, two_dimensional_list is equal to within square brackets [3,5,8,2,1],within another square brackets [4,3,6,2,1] how do we calculate the mean of each row?

2 comma 1 comma within another square brackets 4 comma 3 comma 6 comma 2 comma 1 nom be in the year on the vertical in

mean a connected over the upper a here under Co ductile is still median akin to PD student underscore marks is equal to within square brackets 74 comma 78 comma

2. Calculate the median of the given list? student_marks is equal to within square brackets 74,78,56,87,91,82

56 comma 87 comma 91 comma 82 moon roof Idol our column girl Erica Nam column girl yondu Manju Nandu IND takes two madam aravinda Monell are they upper

And the third question is Suppose there is a file with 6 columns but we wish to load text only in columns 2,3,4,5. How do we specify that?

specifies a body medical Lido Vonzell

And the answers,

Volvo rubra regime viene para num 1 shape function meaner and over the parameter agha possible are the way types a year when the others mean within

1. To get the mean of each row, we just pass 1 as the second parameter to the function mean.

brackets to underscore dimensional underscore list comma one year under

So we have to type mean within brackets two_dimensional_list comma 1

Namco tackle in still median eikan-do pirika function median a pion possible

2. We use the function median to calculate the median of the list

type sega median within brackets student

by typing median within brackets student_marks.

underscore marks Manju file Inc repeater column column word to mature num usecols is equal to 2 comma 3 comma 4 comma 5 ng parameter if I input a column in the

And the final one To specify the particular columns of a file, we use the parameter usecols is equal to 2,3,4,5.

tutorial viola da villian daruka me on a numbered

Hope you have enjoyed this tutorial and found it useful.

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