Number of Trick-or-treaters on Hallow’s eve dependent on day of week, year and phase of moon
This visualization is result of meticulous count of the trick-or-treaters in 30 minute intervals recorded by Jeffrey A. Shaffer who has been tracking this data year by year in Cincinnati, OH. 45207
Source of data: http://www.dataplusscience.com/HalloweenData.html
data visualization 