523: Decline

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Decline
'There is also a spike on the Fourier transformation at the one month mark where--' 'You want to stop talking right now.'
Title text: 'There is also a spike on the Fourier transformation at the one month mark where--' 'You want to stop talking right now.'

[edit] Explanation

Cueball, apparently concerned about the status of his romantic relationship, has constructed a "relationship graph" plotting an ambiguously quantitative metric for love and/or affection against time. He has identified a sudden drop. Cueball's romantic partner (apparently Megan) notes from off screen that the drop corresponds to the moment Cueball's obsession with graphs began. He claims the two events are coincidental, thereby referencing the recurring xkcd theme of correlation not necessarily implying causation.

The Fourier transform is a technique for discovering the periodic characteristic(s) of a function. A spike at one month on the Fourier transform of the love graph would mean that something happens every month that causes the relationship to change. This is presumably a reference to Megan's menstrual cycle, that is, her 'time of the month,' stereotypically depicted as having a woman uncharacteristically crabby or moody at that time.

Fourier transformations were mentioned previously in xkcd.

[edit] Transcript

[Cueball is pointing at a line graph at a specific point where it slopes down. The y-axis shows that as y increases, love increases.]
Cueball: Our relationship entered its decline at this point.
Megan [Outside of panel]: That's when you started graphing everything.
Cueball: Coincidence!
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Discussion

"Wife"? 76.106.251.87 00:33, 27 June 2013 (UTC)

Indeed, plus the notion that Cueball had begun graphing everything at a particular point while prior data had been graphed suggests that he only began presenting this data to Megan at that point, and had been secretly, perhaps obsessively, keeping data well before in their relationship. Thokling (talk) 09:25, 25 September 2013 (UTC)
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