Author Archives: Scott Stoltzman

Random Forest Classification of Mushrooms

There is a plethora of classification algorithms available to people who have a bit of coding experience and a set of data. A common machine learning method is the random forest, which is a good place to start.

This is a use case in R of the randomForest package used on a data set from UCI’s Machine Learning Data Repository.

Are These Mushrooms Edible? Continue reading

City of Fort Collins Spending Analysis

Stoltzmaniac is going local in today’s blog post! I dug into the City of Fort Collins open data and published my findings below.

The data was surprisingly clean and laid out in JSON format on Amazon S3. This post shows my exploration of the data along with some observations. Continue reading

Price Volatility – Basic Brownian Motion

The Situation

You are a consultant who has been hired by a business that sells one commodity product. On December 31st the price is $100 per unit. The business owner wants to know what to expect by the end of January.

Your client gave you the message:

  • Prices are based off the the sales the previous day
  • Roughly 95% of the time, the price will be +/- $10 compared to the day before

With only a few minutes to make the call, how would you decide on what to expect for the end of January? Continue reading

Seinfeld Characters – A Post About Nothing

This post is dedicated to my mother – Seinfeld’s greatest fan.

Seinfeld is a classic TV sitcom. It featured four main characters surrounded by relatively normal, everyday, run of the mill scenarios. In the spirit of Seinfeld, this post will also “be about nothing.” Continue reading

Crime Analysis – Denver-Part 3

Marijuana, Alcohol, and Other Drugs


Continuing our Exploration of the Data
After identifying the sources of crime growth, it’s time to investigate specific crime rates. This blog post addresses drug and alcohol crimes in Denver over the past few years.

This is a very simplistic view because it will only focus on trend data, which never tells the whole story. Continue reading