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QR codes

by: Jason Huber - February 26th, 2011 Add Comment

You may have seen one of these QR Codes in the pages of your favorite magazine, promotional mailer or just around town. The codes are increasing popularly has customers are more reliant on mobile smart phones for information on the go.

What are QR codes?

A QR code is one of the most popular types of two-dimensional (matrix) barcodes. QR is the abbreviation for Quick Response, as the creator intended; the code allows its contents to be decoded at very high speed. The QR Code was created by Toyota subsidiary Denso-Wave in 1994. The code consists of black modules arranged in a square pattern on a white background. Read More

The Social Network rating formula ELO

by: Jason Huber - October 13th, 2010 1 Comment

ELO algorithm used in Facemash.com

Performance can’t be measured absolutely; it can only be inferred from wins, losses, and draws against other players. A player’s rating depends on the ratings of his or her opponents, and the results scored against them. The relative difference in rating between two players determines an estimate for the expected score between them. Both the average and the spread of ratings can be arbitrarily chosen. Elo suggested scaling ratings so that a difference of 200 rating points in chess would mean that the stronger player has an expected score (which basically is an expected average score) of approximately 0.75, and the USCF initially aimed for an average club player to have a rating of 1500. Read More