Speeding up the Bradley Terry Model in R

I am currently developing my first R package which confronted me a lot with the question: “How can I speed up my code?”.

I did some “research” and read a lot of general articles about speeding up code, but also a few posts specifically about speeding up R code. While I mostly got the main points, I always found the example use cases slightly contrived. So I decided to write a little something about one of my use cases which includes many points that I think are important when trying to speed up your code. The method we want to implement in this post is the so called Bradley Terry Model. If you do not care about the theoretical part, you can jump directly to the implementation section.

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