Since I had to cancel most of my travel plans this year due to the Corona pandemic I spent a lot of time browsing through and editing photos from previous vacations. While this activity gave me at least a bit of a holiday feeling it also gave me an idea for a nice little computer vision project. My photo collection is …

As this blog is growing more and more into a portfolio for my data science work I did not want to miss out on the opportunity to (shamelessly) promote my guest post on the AWS blog from November: Advancement in Fraud Detection: ML in Online Survey Research The fraud detection solution described in the blog post was …

In a past project at my previous job our team was building a real-time fraud detection algorithm. The logic of the algorithm was based on the classical outlier definition: flag everything that exceeds the population mean by roughly two standard deviations. The requirements for the response time of the API that would …

In our last post we used sentiment analysis to find out whether there is a difference in the relationship between the wording of restaurant review texts and the associated point score between Stockholm and Berlin. Today we will revisit this subject using a different approach. We will fit statistical models to our data …

A few years ago I came across this very concise but intriguing post on Antonio Sánchez Chinchón’s blog which features a beautiful matrix visualisation technique (as well as a Calle 13 quote). Ever since then I had it on my to-do list to build a similar visualisation but could never quite decide on which matrix I wanted …

In our previous blog post we posed two questions about restaurant reviews from Stockholm and Berlin. Using some actual restaurant review data from Google Maps we were able to find an answer to the first question about whether there is a difference in the point rating distribution between the two cities. In this post we …

Late last summer we spent a couple of weeks on vacation in beautiful Sweden. Back then the Corona pandemic had not yet hit the country quite as hard and it was still possible to go to restaurants without any restrictions. While looking online for nice restaurants to go to we noted some differences in the user reviews …

In the last few weeks I encountered the following question in two separate discussions with friends and colleagues: When doing linear regression in R, will your coefficients vary if you change the order of the predictors in your data? My intuitive answer to this was a clear “No”. Mostly because the practical …

This is the first ever post on our freshly set up blog Natural Blogarithm. This post is merely intended as a smoke test to make sure everything is working as expected. However, it is also a promise of future things to come, so stay tuned! In the meanwhile, if you would like to find out more about the idea behind …