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time series analysis
When the bootstrap doesn’t work
The bootstrap always works, except sometimes. By ‘works’ here, I mean in the weakest senses that the large-sample bootstrap variance correctly estimates the variance of the statistic, or that the large-scale percentile bootstrap intervals have their nominal coverage. I don’t mean the stronger sense that someone like Peter Hall might use,... Read more
Intro to Caret: Pre-Processing
Editor’s note: This is the third of a series of posts on the caret package. Creating Dummy Variables Zero- and Near Zero-Variance Predictors Identifying Correlated Predictors Linear Dependencies The preProcess Function Centering and Scaling Imputation Transforming Predictors Putting It All Together Class Distance Calculations caret includes several functions to pre-process the... Read more
The holiday shopping season is in full swing! The economy is relatively strong compared to a few years back and so retail sales are probably going to be strong especially for amazon. Other retailers like Target and Wal-Mart are also running amazing black Friday and holiday sales to attract customers.... Read more
When I worked at Amazon more than 3 years ago our holiday season was always an adrenaline rush. My role was in customer service operations. We had record breaking volume each holiday season which means customer service was the front line for customer issues, technical support and even catching fraud.... Read more
The phenomenon of the “yearly sports game release” is a well established tradition in the videogame industry. The biggest is, perhaps, the FIFA franchise, reigning supreme leader in its niche, simulated soccer, for most of its over twenty year history. EA Sports released the latest iteration, FIFA 17, a few... Read more
Editor’s note: Opinions expressed in this post do not necessarily reflect the views of #ODSC At the start of this blog series I had no idea how the campaign dialogue would evolve.  I am surprised how the discussion has distanced even farther from issues to personal affairs leaving many Republicans to abandon Donald... Read more
Hackathon Results, Gates Foundation & ODSC
Health. It’s perhaps the thickest thread that runs throughout the human race. What more could we relate than the continuous, futile war against our mortality? In certain areas of the world this war is fought with the most advanced weapons known to man – the best medicines, the best doctors,... Read more
Editor’s note: Opinions expressed in this post do not necessarily reflect the views of #ODSC, nor do they necessarily reflect the views of Edward’s employer. Looks like the presidential race is heating up!  Many polls have the candidates in a tight race.  Just after the debate both Clinton and Trump proclaimed “victory.” Instead... Read more
Editor’s note: Opinions expressed in this post do not necessarily reflect the views of #ODSC, nor do they necessarily reflect the views of Edward’s employer. Part 1 Obtaining Transcripts for Campaign Trail Speeches The political season is long and arduous.  As a former Ohioan I dreaded any election year because it is punctuated... Read more
Intro to Natural Language Processing
Table of Contents 0.0 Setup 0.1 Python and Anaconda 0.2 Libraries 0.3 Other 1.0 Background 1.1 What is NLP? 1.2 Why is NLP Important? 1.3 Why is NLP a “hard” problem? 1.4 Glossary 2.0 Sentiment Analysis 2.1 Preparing the Data 2.1.1 Training Data 2.1.2 Test Data 2.2 Building a Classifier... Read more
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