MAE and RMSE — Which Metric is Better?

Mean Absolute Error versus Root Mean Squared Error

Mean Absolute Error (MAE) and Root mean squared error (RMSE) are two of the most common metrics used to measure accuracy for continuous variables. Not…

Quicksort — The Best Sorting Algorithm?

The time complexity of Quicksort is O(n log n) in the best case, O(n log n) in the average case, and O(n^2) in the worst case. But because it has the best performance in the average case for most inputs, Quicksort is generally considered the “fastest” sorting…

Displaying Progress in a Loop or Function [R]

and how to create a screen recording GIF in Windows 10

While I was waiting for my not-very-complicated setup but complicated gbm model to run (it’s still running), it occurred to me that I…

Weak Law of Large Numbers

The Weak Law of Large Numbers, also known as Bernoulli’s theorem, states that if you have a sample of independent and identically distributed random variables, as the sample size grows larger, the sample mean will tend toward the population mean.

Strassen’s Algorithm for Matrix Multiplication

Given two n by n matrices A and B, the “typical” way of computing their product C = A • B is given by:

Matrix Multiplication: Intuitive Method

Zero Probability

Events that are impossible have zero probability, but the converse is not necessarily true. Clearly an empty set has zero probability. But, a zero probability event does not mean an impossible event.

Python Game Engine: Introduction to Panda3D

I recently finished playing a game called Ori and the Blind Forest, and… oh my…

Scraping Website Tables with `rvest` [R]

It’s easier to write when annoyed.

I don’t understand why some websites that provide databases don’t offer an easy option to download the entire database. They’re already offering the data. And, they must have…

The Egg Dropping Puzzle

Suppose a building has n floors. If we have m eggs, how can we find the minimum number of drops needed to determine from which floors it is safe to drop an egg (in other words, it won’t break)?

Folder Structure for Data Analysis

As I’m starting to work with other people coming from different backgrounds on data analysis projects, one of the more challenging aspects is to determine a folder structure that everyone can buy into.