The Elon Musk Tweet Effect on Dogecoin (DOGE)

July 16, 2021 | Quantargo Blog

The Elon Musk Tweet Effect on Dogecoin (DOGE) Unveil the Dogefather Elon Musk is known for his regular tweets about many different topics—in particular his companies Tesla and SpaceX. With close to 60 million followers he truly is a Twitter celebrity and his opinions have a big impact on technologies ...
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Using R – .Call(“hello”)

July 16, 2021 | jonathanatmazamascience

In an introductory post on R APIs to C code, Calling C Code ‘Hello World!’, we explored the .C() function with some ‘Hello World!’ baby steps.  In this post we will make a leap forward by implementing the same functionality using the .Call() function. Is .Call() better than .C()? A ... [Read more...]

Logging and error handling in operational systems

July 15, 2021 | jonathanatmazamascience

Operational systems, by definition, need to work without human input. Systems are considered “operational” after they have ben thoroughly tested and shown to work properly with a variety of input. However, no software is perfect and no real-world system operates with 100% availability or 100% consistent input. Things occasionally go wrong – perhaps ... [Read more...]

multinomial but unique

July 15, 2021 | xi'an

A quick riddle from the Riddler, where the multinomial M(n¹,n²,100-n¹-n²) probability of getting three different labels out of three possible ones out of three draws is 20%, inducing a single possible value for (n¹,n²) up to a permutation. Since this probability is n¹n²(100-n¹-n²)/161,700, ...
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When k-means clustering fails

July 15, 2021 | jonathanatmazamascience

Letting the computer automatically find groupings in data is incredibly powerful and is at the heart of “data mining” and “machine learning”. One of the most widely used methods for clustering data is k-means clustering. Unfortunately, k-means clustering can fail spectacularly as in the example below. Centroid-based clustering algorithms work ...
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Workflows for querying databases via R

July 13, 2021 | rstats | Emily Riederer

Simple, self-contained, reproducible examples are a common part of good software documentation. However, in the spirit of brevity, these examples often do not demonstrate the most sustainable or flexible workflows for integrating software tools into large projects. In this post, I document a few mundane but useful patterns for querying ... [Read more...]
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