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Avoiding the crowds in Melbourne CBD using data

I love visiting the CBD of Melbourne - it is a beautiful place with great restaurants, cafes, shopping and museums. Unfortunately, as with any big city it can get really crowded at times, which can sap a bit of enjoyment for a nerd like me! Imagine …

Posted on October 21, 2015 • 9 minutes read Read on
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Using k-fold cross-validation to estimate out-of-sample accuracy

One of the biggest issues when building an effective machine learning algorithm is overfitting. Overfitting is where you build a model on your training data and it not only picks up the true relationship between the outcome and the predictors, but …

Posted on October 14, 2015 • 7 minutes read Read on
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Two-group hypothesis testing: permutation tests

In the last blog post I described how you could test whether the difference between two groups was statistically significant using an independent-samples t-test. (I will rely heavily on that blog post in this one, so I encourage you to at least skim …

Posted on October 7, 2015 • 6 minutes read Read on
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Two-group hypothesis testing: independent samples t-tests

In some of my previous posts, I asked you to imagine that we work for a retail website that sells children's toys. In the past, they've asked us to estimate the mean number of page views per day (see here and here for my posts discussing this …

Posted on September 30, 2015 • 9 minutes read Read on
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Interactive model decision trees in Stata

When I was doing statistical consulting work in a university's medical department, my clients often wanted me to teach them about the analyses I was doing for them, rather than just completing the work and handing it over. In addition, they were …

Posted on September 22, 2015 • 9 minutes read Read on
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