an ES2015 fork of @syntagmatic’s nice Baseball Scatterplot Matrix
this iteration also adds an slider to adjust the fill-opacity or the SVG circles used as scatterplot marks. The bl.ocks:
helped me debug the HTML5 <input type='range'> element I use for the slider control.
Scatterplot matrix design invented by J. A. Hartigan and described in his 1975 paper Printer graphics for clustering. 1986 baseball statistics data from the R package Visualizing Categorical Data.
Based on Scatterplot Matrix Brushing, but still awaiting the d3.v4 brush component.