Prediction Assignment – Practical Machine Learning

novembro 11, 2016 § Deixe um comentário

To those whom are eager to know more about Machine Learning and how it goes in a real life work, I share a paper I wrote with analysis, codes and algorithms of a Machine Learning Prediction Assignment. I wrote the codes in R, which is a statistical programming language. I also would like to thank PUC-Rio for providing the dataset that I worked.

Executive Summary

Using devices such as Jawbone Up, Nike FuelBand, and Fitbit it is now possible to collect a large amount of data about personal activity relatively inexpensively. These type of devices are part of the quantified self movement – a group of enthusiasts who take measurements about themselves regularly to improve their health, to find patterns in their behavior, or because they are tech geeks. One thing that people regularly do is quantify how much of a particular activity they do, but they rarely quantify how well they do it. In this project, your goal will be to use data from accelerometers on the belt, forearm, arm, and dumbell of 6 participants. They were asked to perform barbell lifts correctly and incorrectly in 5 different ways.

Data source

The data for this project came from the Human Activity Recognition study, conducted by Pontifícia Universidade Católica – Rio de Janeiro.

Ugulino, W.; Cardador, D.; Vega, K.; Velloso, E.; Milidiu, R.; Fuks, H. Wearable Computing: Accelerometers’ Data Classification of Body Postures and Movements. Proceedings of 21st Brazilian Symposium on Artificial Intelligence. Advances in Artificial Intelligence – SBIA 2012. In: Lecture Notes in Computer Science. , pp. 52-61. Curitiba, PR: Springer Berlin / Heidelberg, 2012. ISBN 978-3-642-34458-9. DOI: 10.1007/978-3-642-34459-6_6.

The paper

It can be accessed at:

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