Python for data science
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Charlotte Bots and AI Meetup presentation by Sankalp Gabbita, MS Graduate specializing in Data Science from UNC Charlotte
![NumPy- Numerical Computing
Similar to creation of Matlab array objects
N-dimensional array objects
Used for linear algebra, fourier transform, and random number capabilities
Capable of matrix operations, string operations, and binary operations
Easy to install and import with single line
Import numpy as np
The above code fetches numpy package and it can be used with it’s alias as np
eg., np.array([(2,3),(4,5)])](https://image.slidesharecdn.com/pythonfordatascience-170505023358/85/Python-for-data-science-7-320.jpg)
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Python for data science
- 1. Python for Data Science Sankalp Gabbita Graduate Student-Data Science and Business Analytics UNC Charlotte
- 2. How is Data used? The extensive use of data, statistical and quantitative analysis, explanatory and predictive models, and fact-based management to drive decisions and actions. (Davenport and Harris 2007) Data Analytical Tools Actionable Knowledge
- 5. Agenda Anaconda – Spyder Review of NumPy,Pandas- Basic data munging Using Matplotlib to make visualizations Regression concepts Regression – Application( Scikit-Learn) Clustering concept Clustering Application( K- mean clustering using Scikit-Learn)
- 6. SPYDER -Scientific Python Development Environment Spyder is an interactive development environment for the Python language with advanced editing, live testing, and a numerical computing environment Spyder also includes the popular Python library NumPy for linear algebra, MatPlotLib for interactive 2D/3D graphs, Pandas for dataset manipulation, and SciKit-Learn for machine learning. Code line by line Interact and alter scripts Code directly in the console Spyder is accessible through Anaconda https://www.continuum.io/downloads
- 7. NumPy- Numerical Computing Similar to creation of Matlab array objects N-dimensional array objects Used for linear algebra, fourier transform, and random number capabilities Capable of matrix operations, string operations, and binary operations Easy to install and import with single line Import numpy as np The above code fetches numpy package and it can be used with it’s alias as np eg., np.array([(2,3),(4,5)])
- 8. Pandas- Dataframes Creates an efficient dataframe object for data manipulation with integrated indexing Takes input data in many formats: CSV, Excel, SQL databases Handles messy and missing data easily Slicing, dicing and indexing of large datasets Very useful for cleaning the data before applying any algorithm Can be imported with single line Import pandas as pd Eg : pd.read_table(‘—file path in local machine-’)
- 9. Matplotlib-Visualization Python 2D plotting library to generate quality figures Generates plots, histograms, bar charts, scatterplots, etc., Uses NumPy NDArrays to plot graphs Full control of font styles , line properties , axes properties, etc. Easy to install and import using single line Import matplotlib Pyplot module is used for simple plotting and provides good interface when combined with Ipython
- 10. Regression One Dependent Variable Y Independent Variables X1,X2,X3,... Y = ß0 + ß1 X(1) + ß2 X(2) + ß3 X(3) + ... + ßk X(k) + E Estimate the ß's in multiple regression using least squares Sizes of the coefficients not good indicators of importance of X variables
- 11. Simple Linear Regression Model
- 12. Key Assumptions for Linear Regression Linearity The dependent variable is a linear combination of independent variables Homoscedasticity Constant variance in errors Normality Independence of errors
- 13. Logistic Regression Binary target: linear regression does not work due to unbounded results
- 14. Key Assumptions for Logistic Regression Linearity Linearity of independent variables and log odds Homoscedasticity: no Normality: no Highly skewed independent variables can still be problematic Independence of errors: yes
- 15. Clustering Cluster analysis is the generic name for a wide variety of procedures that can be used to create a classification of entities/objects It has been referred to as Q analysis, typology construction, classification analysis, unsupervised pattern recognition, and numerical taxonomy A deck of 52 cards can be grouped as: 26 red and 26 black cards 13 each of Spades, Hearts, Diamonds, and Clubs 4 each of Aces, Kings, Queens, and Jacks
- 16. A Geometrical view of an ideal pattern Importance of Price ImportanceofQuality
- 18. How to group them? Importance of Price ImportanceofQuality Importance of Price ImportanceofQuality Importance of Price ImportanceofQuality
- 19. Similarity and Distance To identify natural groups, we must first define a measure of similarity (proximity) between objects/entities. Assume variables (axes in space) are numeric. Then, if two things are similar, they should be close to each other in the space. That is, the distance between them should be small. But, if two things are dissimilar, they should be well separated from each other in the space. That is, the distance between them should be large. A collection of similar things would therefore likely result in more cohesive (homogenous) groups than a collection of dissimilar things.
- 20. Dimension1 A B K E Dimension 2 F G H I J D C K- Means Clustering 1. Select k cluster centers. 2. Assign cases to closest center. 3. Update cluster centers. 4. Re-assign cases. 5. Repeat steps 3 and 4 until convergence. Dimension1 A B K E Dimension 2 F G H I J D C Dimension1 A B K E Dimension 2 F G H I J D C Dimension1 A B K E Dimension 2 F G H I J D C
- 21. Thank You