Often on Sciblogs someone ends up pointing out that another commenter's 'evidence' is anecdotal, and thus doesn't offer particularly strong support for a particular point of view. I'm kicking myself for not providing the link to this video, the last time it happened :-)
At least a couple of times I've made a comment along the lines of "the plural of anecdote is not data". Now here's an excellent video (courtesy of Evidence-Based Thought) that explains why not:
Science & Engineering - Creating the Future!
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Last modified: Wed Nov 30 17:23:29 2011
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URL: http://sci.waikato.ac.nz/bioblog/2011/07/why-anecdotal-evidence-is-prob.shtml
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Is everyone else enjoying the irony of all the anecdotes used in this video :)