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#+TITLE: 
#+AUTHOR: FOSSEE
#+DATE
#+EMAIL:     info@fossee.in

#+DESCRIPTION: 
#+KEYWORDS: 
#+LANGUAGE:  en
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* 
#+begin_latex
\begin{center}
\vspace{12pt}
\textcolor{blue}{\huge Statistics}
\end{center}
\vspace{18pt}
\begin{center}
\vspace{10pt}
\includegraphics[scale=0.95]{../images/fossee-logo.png}\\
\vspace{5pt}
\scriptsize Developed by FOSSEE Team, IIT-Bombay. \\ 
\scriptsize Funded by National Mission on Education through ICT\\
\scriptsize  MHRD,Govt. of India\\
\includegraphics[scale=0.30]{../images/iitb-logo.png}\\
\end{center}
#+end_latex
* Objectives
  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.
* Pre-requisite
  Spoken tutorial on -
  - Loading Data from files.
  - Getting started with Lists.
  - Accessing Pieces of Arrays.
* Data set
  - A;015163;JOSEPH RAJ S;083;042;47;00;72;244;;; 

  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 72
   - Total marks 244

* Exercise 1
  - In the given file football.txt at path /home/fossee/football.txt , 
    one column is player name,second is goals at home 
    and third goals away.
    - Find the total goals for each player
    - Mean home and away goals
    - Standard deviation of home and away goals 

* Solution 1
#+begin_src python
  L=loadtxt('/home/fossee/football.txt',usecols=(1,2),
            delimiter=',')
  sum(L,1)
  mean(L,0)
  std(L,0)
#+end_src python
* Summary 
  In this tutorial,we have learnt to -

  - Do the standard statistical operations sum , mean
    median and standard deviation in Python.
  - Combine text loading and the statistical operation to solve
    real world problems.
* Evaluation
  1. Given a two dimensional list,
     two\_dimensional\_list=[[3,5,8,2,1],[4,3,6,2,1]]
     how do we calculate the mean  of each row?
   
  2. Calcutate the median of the given list?
     student\_marks=[74,78,56,87,91,82]

  3. 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?
* Solutions
  1. mean(two\_dimensional\_list,1)

  2. median(student\_marks)

  3. We use the parameter usecols=(2,3,4,5)
* 
#+begin_latex
 \begin{block}{}
  \begin{center}
  \textcolor{blue}{\Large THANK YOU!} 
  \end{center}
  \end{block}
\begin{block}{}
  \begin{center}
    For more Information, visit our website\\
    \url{http://fossee.in/}
  \end{center}  
  \end{block}
#+end_latex