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Revision as of 19:09, 27 February 2013


Welcome to the explain xkcd wiki!

We have collaboratively explained Expression error: Unrecognised punctuation character ",". xkcd comics, and only Expression error: Unrecognised punctuation character ",". (Expression error: Unrecognised punctuation character ",".%) remain. Add yours while there's a chance!

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Go to this comic explanation

P-Values
If all else fails, use "signifcant at a p>0.05 level" and hope no one notices.
Title text: If all else fails, use "signifcant at a p>0.05 level" and hope no one notices.

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: First draft.

This comic is based off of the probability, or "p", value. This is a concept in statistics which represents the chance that a set of data occurred randomly. A high p-value indicates that the data was not significant, in that any differences between test groups could have occurred randomly, and not due to what was being tested. A low p-value, however, indicates that the data was not produced randomly, and that differences between test groups is likely to have been the result of whatever experimental method was used. The highest p-value at which most studies typically draw significance is p<.05 (or less than 5%), which is why all p-values in the comic below that number are marked at least significant. .050 is labeled "Oh crap. Redo calculations," because the p-value is very close to being considered significant, but isn't. Redoing the calculations may result in a different answer, but it is not guaranteed that it will be lower than .050. Values that are higher than .050 and lower than .1 are considered to be suggesting significance without actually supporting it, which will likely support additional trials.

The title text suggests that, if the results cannot be normally considered significant, to invert p<.050, making it p>.050. This is intended to fool casual readers, as the change is only to the inequality sign, which may be ignored.

Transcript

Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.



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