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Data Envelopment Analysis Tutorial

February 24, 2014 Vasilis Vryniotis . 3 Comments Data Envelopment Analysis, also known as DEA, is a non-parametric method for performing frontier analysis. It uses linear programming to estimate the efficiency of multiple decision-making units and it is commonly used in production, management and economics. The technique was first proposed by Charnes, Cooper and Rhodes in 1978 and since then

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How to build your own Facebook Sentiment Analysis Tool

February 3, 2014 Vasilis Vryniotis . 7 Comments In this article we will discuss how you can build easily a simple Facebook Sentiment Analysis tool capable of classifying public posts (both from users and from pages) as positive, negative and neutral. We are going to use Facebook’s Graph API Search and the Datumbox API 1.0v. Similar to the Twitter Sentiment

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Developing a Naive Bayes Text Classifier in JAVA

January 27, 2014 Vasilis Vryniotis . 16 Comments In previous articles we have discussed the theoretical background of Naive Bayes Text Classifier and the importance of using Feature Selection techniques in Text Classification. In this article, we are going to put everything together and build a simple implementation of the Naive Bayes text classification algorithm in JAVA. The code of

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Using Feature Selection Methods in Text Classification

January 20, 2014 Vasilis Vryniotis . 5 Comments In text classification, the feature selection is the process of selecting a specific subset of the terms of the training set and using only them in the classification algorithm. The feature selection process takes place before the training of the classifier. Update: The Datumbox Machine Learning Framework is now open-source and free

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