Tag Archives: R-Bloggers

Data Visualization – Part 2


A Quick Overview of the ggplot2 Package in R

While it will be important to focus on theory, I want to explain the ggplot2 package because I will be using it throughout the rest of this series. Knowing how it works will keep the focus on the results rather than the code. It’s an incredibly powerful package and once you wrap your head around what it’s doing, your life will change for the better! There are a lot of tools out there which provide better charts, graphs and ease of use (i.e. plot.ly, d3.js, Qlik, Tableau), but ggplot2 is still a fantastic resource and I use it all of the time.

In case you missed it, here’s a link to Data Visualization – Part 1

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Data Visualization – Part 1


Introduction to Data Visualization – Theory, R & ggplot2

The topic of data visualization is very popular in the data science community. The market size for visualization products is valued at $4 Billion and is projected to reach $7 Billion by the end of 2022 according to Mordor Intelligence. While we have seen amazing advances in the technology to display information, the understanding of how, why, and when to use visualization techniques has not kept up. Unfortunately, people are often taught how to make a chart before even thinking about whether or not it’s appropriate.

In short, are you adding value to your work or are you simply adding this to make it seem less boring? Let’s take a look at some examples before going through the Stoltzmaniac Data Visualization Philosophy.

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Should I Learn R or Python? … It Doesn’t Matter

Should I learn R or Python for data science?

I am asked this question regularly, both online and in person. There is a simple answer: it doesn’t matter. There are pros and cons to both which have been written about extensively so I won’t reinvent the wheel by making a list here (do a quick search in Google and you’ll find tens of thousands of relevant results).

The fact is, you’re asking the wrong question. 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