The Data Den


Projects on Math + Visualization + Machine Learning
by Alexandru Papiu

Strategies for the Board Game Risk

The game of Risk is a turn-based strategy game where players battle each other to take over the world. Your aim is to control as many of the forty-two territories with the armies at your disposal. The way you gain ground is by attacking enemy territories via rolling dice. Here... [Read More]

Tipsforvisualization

D3: A true bar chart with SVG rects Click me. var n = 3000; var w = 600; var h = 600; var color = d3.scale.category10() var data... [Read More]

Cross Validation Error Pitfalls

Let’s say you have 10 models that you’d want to test and roughly all models have the same cross validation error distribution: the Cross Validation Mean Squared Error is normally distributed with mean = 3 and standard deviation equal to .2. Since CV error is an average of a bunch... [Read More]

Singlehood in America - a look at the ACS Census

I will be looking at data from the American Community Survey and try to find patterns in the way Americans date, marry and divorce. This is still work in progress but I figured I’d add some plots and maps to begin with. <a href="https://plot.ly/~apapiu/6/" target="_blank" title="Marital Status by Age"... [Read More]