In dbranquinho/zipf:

knitr::opts_chunk$set(echo = TRUE)

Introduction

This is a library created as a package in Language R. Its purpose is to classify text documents. The application's Intelligence can perceive the subject being discussed in the texts and evaluate the distance to other documents.

Distance from documents is a metric based on Zipf's Law, an empirical law formulated using mathematical statistics that refers to the fact that many types of data studied in the physical and social sciences can be approximated with a Zipfian distribution, one of a family of related discrete power law probability distributions. The law is named after the American linguist George Kingsley Zipf (1902–1950), who popularized it and sought to explain it (Zipf 1935, 1949), though he did not claim to have originated it.[1] The French stenographer Jean-Baptiste Estoup (1868–1950) appears to have noticed the regularity before Zipf. It was also noted in 1913 by German physicist Felix Auerbach (1856–1933).

The simplicity of the algorithm is its great attraction. Speed is a consequence of this simplicity and lightness. Zipf's law suite provides collection, extraction, cleanup, transformation, and text classification features. It extends the concept of distance, such as the Euclidean and Manhattan distances, as the distance Erlei from Zipf.

After transforming the words (terms) of the text into TF-IDF metrics, the algorithm creates sparse vectors to calculate the distances by the Zipf's Law.

This package can be install from RStudio line command:

install_github("dbranquinho/zipf")

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The Dataset

The "Tribuna" database is of journalistic origin with its digital publication, a factor that may be important for professionals of the area, also serving to understand other similar datasets. In order to carry out the experiment, we adopted the "A Tribuna" database, whose main characteristics presented previously, show that the collection is a good source of research, since it is already classified by specialists and has 21 classes that can be Displayed in the table below.

The Research

Today hundreds of journalistic documents are published daily on the Internet. Experts strive to develop techniques that can improve performance in the classification and understanding of the texts of the published documents.

We have tried to automatically classify the journalistic classes of A Tribuna. There are 21 classes that are shown graphically below.

About Class and its DNA

These are the classes and their Chromosome. This was extracted through the Vector Model with the Terms Frequency and the Inverse Document Frequency metrics (TF-IDF).

Comparing Files

Let's compare an AT2 Class file with AT2 Class Chromosome.

Let's compare an BRO Class file with AT2 Class Chromosome.

This small attempt demonstrates that the class chromosome can statistically classify the inferred files to the algorithm.

Conclusion

We have 72% accuracy for hard separation classes, but other documents with good separation we got 92%, that's a good result to precision rates.

The Scientist

dbranquinho/zipf documentation built on May 12, 2019, 2:06 p.m.