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See my blog for more information about this graph!

There's a Wikipedia page about Friday the 13th (https://en.wikipedia.org/wiki/Friday_the_13th ), 
and way back in 2009 (when I was working on this graph), the Wikipedia page claimed that 
"Any month's 13th day will fall on a Friday if the month starts on a Sunday. In 2009 
this applies to the months of February, March, and November. The next instance of this 
appears on the calendar for the year 2015."
(here's this old version of that page, via the "Wayback Machine" archive, as proof that's 
what they said: https://web.archive.org/web/20091103120519/https://en.wikipedia.org/wiki/Friday_the_13th)

*But*, the SAS calendar chart graph I had created said there were 3 Friday the 13th in 2012 . 
ie, 2015 was not the next year to have 3 Friday the 13th - 2012 was. Therefore the Wikipedia 
page was wrong, and my SAS graph disproved/debunked it! 

Just goes to show - don't believe everything you read! ... Unless it's SAS output! 

Here's a screen-capture of the incorrect Wikipedia page (from 2009)...



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