Elastic net regularization is a method that reduces the danger of overfitting in the context of regression (see http://en.wikipedia.org/wiki/Elastic_net_regularization). The elastic net regularization combines linearly the least absolute shrinkage and selection operator (LASSO) and ridge methods. LASSO limits the so-called L1 norm or Manhattan distance. This norm measures for a points pair the sum of absolute coordinates differences. The ridge method uses a penalty, which is the L1 norm squared. For regression problems, the goodness-of-fit is often determined with the coefficient of determination also called R squared (see http://en.wikipedia.org/wiki/Coefficient_of_determination). Unfortunately, there are several definitions of R squared. Also, the name is a bit misleading, since negative values are possible. A perfect fit would have a coefficient of determination of one. Since the definitions allow for a wide range of acceptable values, we should aim for a...
Python Data Analysis
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Python Data Analysis
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Overview of this book
Table of Contents (22 chapters)
Python Data Analysis
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Free Chapter
Getting Started with Python Libraries
NumPy Arrays
Statistics and Linear Algebra
pandas Primer
Retrieving, Processing, and Storing Data
Data Visualization
Signal Processing and Time Series
Working with Databases
Analyzing Textual Data and Social Media
Predictive Analytics and Machine Learning
Environments Outside the Python Ecosystem and Cloud Computing
Performance Tuning, Profiling, and Concurrency
Key Concepts
Useful Functions
Online Resources
Index
Customer Reviews