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John Smethurst
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Head of Data Science
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1 Rule Prediction

Posted on December 29, 2018 at 11:00pm 3 Comments

I originally started writing this notebook to serve as an introduction decision trees. It's a description of the "1-rule" algorithm which I think is worth studying for the following reasons:

  • It’s arguably the simplest and most useful machine learning algorithm you can learn
  • It’s a simple introduction to “decision…
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The "lxml" Package and xpath Expressions for Web Scraping

Posted on December 29, 2018 at 10:30pm 0 Comments

The Jupyter notebook at this link contains a tutorial that explains how to use the lxml package and xpath expressions to extract data from a webpage.

The tutorial consists of two sections:

  • A basic example to demonstrate the process of downloading a webpage, extracting data with lxml and xpath and analysing it with pandas
  • A comprehensive…
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Markov Chains

Posted on May 12, 2018 at 7:00am 1 Comment

I've recently spent a bit of time getting to grips with Markov Chains. I've created a jupyter notebook which attempts to give an "intuition" into the basic concepts; an overview of some of the maths involved and a idea to use "social mobility" probability density functions with Markov Chains to estimate long term "social class" proportions.

This…

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