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Latest revision as of 09:15, 8 February 2016

Welcome to the explain xkcd wiki!
We have an explanation for all 1724 xkcd comics, and only 19 (1%) are incomplete. Help us finish them!

[edit] Latest comic

Go to this comic explanation

Linear Regression
The 95% confidence interval suggests Rexthor's dog could also be a cat, or possibly a teapot.
Title text: The 95% confidence interval suggests Rexthor's dog could also be a cat, or possibly a teapot.

[edit] Explanation

Linear regression is a method for modeling the relationship between two sets of data, assuming that the two have a linear correlation (as opposed to, say, a quadratic correlation or no correlation whatsoever). Constellations are patterns created by linking the apparent positions of stars. One could create fake constellations by connecting assorted points.

In this comic, a set of data has had linear regression and some form of statistical analysis applied to it, indicating that there is a slightly significant correlation between the two. However, the data points are so widely-scattered that (as noted in the comic) it is easier to connect the data points in a constellation-like pattern than it is to determine whether the correlation is negative or positive (without looking at the trendline, of course). Because of this, Randall suggests we should be suspicious of any conclusions drawn from this data.

[edit] Transcript

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

panel 1:a scatter plot with many dots and a slightly rising like is presented. the line is red, and the bottom of the panel reads R2=0.06 in red. panel 2: the same plot, but with new red lines making a constellation of a stick man holding a dog/teapot/cat/???. it says at the bottom of this panel "REXTHOR,THE DOG-BEARER. beneath both panels is the text "I don't trust linear regressions when its harder to guess the direction of the correlation from the scatter plot than to find new constellations in it."

the title text reads"The 95% confidence interval suggests Rexthor's dog could also be a cat, or possibly a teapot."

Is this out of date? Clicking here will fix that.

[edit] New here?

Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes and everything in between. If it is referenced in an xkcd web comic, it should be here.

  • There are incomplete explanations listed here. Feel free to help out by expanding them!
  • We sell advertising space to pay for our server costs. To learn more, go here.

[edit] Rules

Don't be a jerk.

There are a lot of comics that don't have set-in-stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to (and helping everyone better understand) xkcd... and of course only submit material that can legally be posted (and freely edited). Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

If you need assistance from an admin, post a message to the Admin requests board.

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