explain xkcd - User contributions [en]

1615: Red Car

2021-07-01T00:38:59Z

141.101.69.153: /* Explanation */ people with medical problems can buy cars

{{comic
| number = 1615
| date = December 11, 2015
| title = Red Car
| image = red_car.png
| titletext = That guy only drives an alkaline car to overcompensate for his highly acidic penis.
}}

==Explanation==
This comic is a take on the common stereotype that men who drive large, expensive, and/or ostentatious cars (such as sports cars, highly modified cars, and lifted pick-up trucks), do so in order to compensate for insecurity about their manhood. Typically this is summarized as saying they are compensating for having small penises.

{{w|Cyan}} is a greenish-blue color that is not a basic color term in most languages. It is the {{w|complementary color}} to red in the CMYK (subtractive) or RGB (additive) color models.

[[Megan]], upon seeing [[Hairy]] drive past in a red convertible, tells [[Cueball]] that Hairy must be compensating for his cyan colored penis.

This comic thus generalizes the original stereotype to an assumption that men drive cars that compensate for problems/properties with their penis (e.g. large car for small penis). Under this principle, a red car would complement (be the opposite of) a cyan penis. This is of course ridiculous, as red cars are quite common and cyan penises either extremely rare or nonexistent; but maybe Megan doesn't realize this, or is joking.

There may also be a reference to the Doppler shift, where an object moving away (such as a galaxy) appears slightly redder than its true color. On the contrary, objects moving closer shift blue or cyan. However, cars cannot go nearly as fast to create a change in the perceived color.

In the title text another pair of opposites are mentioned: {{w|acid}} and {{w|alkaline}}. Acidity is an extremely odd property to try to compensate for with one's choice of car. Additionally, most penises share the same basic chemical composition and therefore the same acidity. If your penis can be described as "highly acidic", you probably have a major medical problem. Again this could be Megan's lack of understanding, and since some models of cars are called [http://jalopnik.com/5327974/why-cant-you-get-a-nice-basic-car-these-days basic cars] (instead of a special red convertible) she could make the (wrong) assumption that they drive a basic car to compensating for their acidic penises.

Thus, this comic is referring to the actual definition of "compensation", which means to balance something out by adding another. If an image has too much red value on the RGB scale, one could shift it more towards neutral by adding to the blue value. And a solution with a low (acidic) pH can be neutralized by mixing it with an alkaline solution to bring its pH to a neutral value. (Whereas a big car will not balance out a small penis!{{Citation needed}})

An alternative interpretation to this just being about opposites is that of a more specific big vs small compensation. In each case the car represents something larger than Hairy's penis: in the comic - red has a "bigger" (longer) wavelength than cyan. Similarly in the title text, alkali has a "bigger" (higher) ph than acid. Of course against this alternative is that red has a smaller energy/frequency than cyan and that you would often talk about stronger acids, making a low ph count as strong, not small! Finally the joke loses some value if it is still just a matter of big/small rather than actual properties of the penis that are being compensated for.

==Transcript==
:[Megan and Cueball are standing next to an intersection as Hairy drives by in a red convertible.]
:Megan: I bet he just drives that car to overcompensate for his cyan penis.

{{comic discussion}}
[[Category:Comics with color]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Penis]]

Talk:2393: Presidential Middle Names

2020-12-03T10:44:09Z

141.101.69.153:

I wonder where Hussein comes in in the official rankings. [[User:Orion205|Orion205]] ([[User talk:Orion205|talk]]) 04:16, 3 December 2020 (UTC)

Gamaliel sounds like an Elvish name...[[Special:Contributions/108.162.216.128|108.162.216.128]] 05:03, 3 December 2020 (UTC)

For the record, this was his paternal grandmother's maiden name. [[User:RAGBRAIvet|RAGBRAIvet]] ([[User talk:RAGBRAIvet|talk]]) 09:18, 3 December 2020 (UTC)

My understanding of the title text is that Hayes was previously in 3rd position, but has been demoted to 4th and no longer appears in the top 3, not that he is at the bottom of the list.[[Special:Contributions/141.101.99.243|141.101.99.243]] 09:39, 3 December 2020 (UTC)
>The title text literally says "The bottom of the list". How can you read that as not meaning "the bottom of the list"??? [[Special:Contributions/141.101.69.153|141.101.69.153]] 10:44, 3 December 2020 (UTC)

Talk:2295: Garbage Math

2020-04-19T21:53:55Z

141.101.69.153: /* Inclusion in Series */

== Inclusion in Series ==
This is not a Covid19 comic. One could think that this is a comment on the difficulties of modeling the corona virus outbreak, but since discussions of exponential functions are only a small part in the comic I believe it is just a general comment on floating point arithmetic mixed in with statistical considerations. --[[Special:Contributions/108.162.229.242|108.162.229.242]] 17:28, 17 April 2020 (UTC)
:I disagree that this is not a COVID-19 comic. I also believe the one about visualizing large numbers was COVID-19 related. On the other hand, I like the idea that Randall might produce exactly 19 comics related to SARS CoViD 2019, so I'm prepared to concede the point for the sake of arbitrary numerological appeal.
:[[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 18:42, 17 April 2020 (UTC)
::I think Exa-Exabyte was a real stretch (the virus doesn't even have DNA), but there is a tenuous link so whatever. The idea that ''this'' comic is related, on the other hand, stretches past the breaking point. There's hardly anything that can't be linked to global events if we try hard enough, but that doesn't mean there's an actual link. Sometimes a comic about garbage math is just a comic about garbage math. [[Special:Contributions/172.69.71.58|172.69.71.58]] 19:33, 17 April 2020 (UTC)
:::I think this one's much more likely to be a coronavirus comic than Exa-Exabyte was. There's an awful lot of COVID data, much of it either very imprecise or outright garbage; and the comic directly before this one ([[2294]]) involved bad modeling of said COVID data, so clearly COVID data (and its limitations) is something Randall's currently thinking of and drawing comics about. [[User:Pelosujamo|Pelosujamo]] ([[User talk:Pelosujamo|talk]]) 20:25, 17 April 2020 (UTC)
::::Exa-Exabyte was centered around biology, which gives reason to believe it was covid19 related. This one seems much more uncertain. Any conclusion that it is related is based on garbage. Jokes aside, It seems like much more of a stretch to me. Randall thinking in those terms is a reasonable argument, but personally I am going to assume this is the chain breaker unless a direct reference is made in the next couple comics since ending at 19 is would be appropriate. [[Special:Contributions/172.69.70.209|172.69.70.209]]
:: While this comic has no ''direct'' reference to Covid-19 it does appear that the math might be related. At this point we can't know if the series has ended. As such I've edited the paragraph in the explanation to identify the known ambiguities. And now I realize I've made an explanatory paragraph about "knowledge error bars" in the explanation of a comic about numerical error bars.[[User:Iggynelix|Iggynelix]] ([[User talk:Iggynelix|talk]]) 14:42, 18 April 2020 (UTC)
:::No. The reason it appears the math might be related is ''because the math relates to everything, everywhere''. That's not enough of a connection. During this pandemic, there will be a lot of comics related to the coronavirus, many of them in a row, but that doesn't mean that every comic that could be tangentially related if you squint just right should qualify as a COVID-19 comic (I ''still'' think Exa-Exabyte doesn't). There needs to be a real link, because just about ''anything'' could be twisted into a relation if you try hard enough. As a test, I hit [[Special:Random]] and got [[346: Diet Coke+Mentos]]. Wouldn't you know, that's a coronavirus comic! The father, you see, actually had COVID-19 and died, but Diet Coke and Mentos has brought him back! No. The line should be drawn here. The streak has ended. [[Special:Contributions/172.69.68.197|172.69.68.197]] 17:02, 18 April 2020 (UTC)
::::I agree this is not a serious contender for inclusion as a COVID comic. Although I'm pretty sure Randall has input to COVID19 models as garbage on his mind. But there is nothing in this comic that suggest this math be used on a pandemic. The exa byte is a different story as it is about how much of biology we cannot know or control in the midst of a lot of comics about some new biology we do not control. I do not expect that this will end the covid19 series, but I will consent that even if the next comic is a clear corona comic, it will no longer be an unbroken streak. Anyway the real streak ended at the end of March with the late April Fool's comic. I also do not at all think that the coke mentos could be seen as a COVID19 comic, that is just bulls**t trying to prove a point that I believe you fail completely. I also tried random comic (I like the idea) and found [[1208: Footnote Labyrinths]]. It is a scientific paper (with nested footnotes) and given science, we could say it was about science about Corona. Naah. But for the same reason this comic should not be considered corona. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 20:53, 18 April 2020 (UTC)

:::::I am pretty sure this IS related. Right now, everybody and his grandmother is staring at the Johns Hopkins Coronavirus numbers for different countries. Entire newspaper articles are written about these numbers and about why one country is apparently faring better than the other and what this means. The numbers are made into fancy graphics. People use these numbers to calculate fatality rates and cure rates. Politicians might even use these numbers to make decisions.
:::::And all this even though everybody KNOWS that the numbers cannot really be compared from one country to the other, because testing prerequisites vary, testing availability varies, testing procedures vary, criteria used to include a death as a coronavirus death vary. The sources of the numbers are very different and might not always be reliable. [Apparently, they include local language newspapers, website and even social media accounts. How many people DOES the Johns Hopkins University have to track all these sources reliably, worldwide, in local languages?] And not to forget some countries probably are downright lying.
:::::And still, people are comparing. I've read articles where the author admits the numbers are probably garbage in one sentence and then STILL goes on to calculate fatality rates from them in the next sentence. So, most PROBABLY related. --[[Special:Contributions/141.101.69.153|141.101.69.153]] 21:53, 19 April 2020 (UTC)

== Math and Error bars ==

Well this is surprising came here thinking I understood it just to see what the discussion looked like. Ended up learning something new. I was able to understand intuitively the comic. But this is my first exposure to actually doing math on the error bars. I think I was supposed to do that in college but I don't remember anyone ever explaining how it should work. --[[Special:Contributions/162.158.63.208|162.158.63.208]] 18:14, 17 April 2020 (UTC)

In recent days, there have been a number of math "quizzes" in this same type of format, albeit generally with only addition and maybe multiplication, appearing on Facebook. Should the explanation include a reference to this as a possible contributing reason for Randall's comic? One could also argue that those quizzes have been appearing on Facebook as a way to spend/waste time during the coronavirus pandemic lock-down, making he comic at least tangentially related to Covid19 LIES.
:: Unsigned vandalism? /\ [https://www.explainxkcd.com/wiki/index.php?title=Talk:2295:_Garbage_Math&diff=190866&oldid=190856 change history] @user Please feel free to move your discussion to an appropriate forum and remove both the edit and this comment at such time. [[User:Iggynelix|Iggynelix]] ([[User talk:Iggynelix|talk]])

What's the difference between relative error and absolute error? I don't understand these terms. Maybe add?
: Absolute error is the amount of uncertainty in a value measured as a given number. e.g. 5.7 ± 1.2 means that actual value lies somewhere between 5.7 - 1.2 and 5.7 + 1.2 = 4.5 to 6.9. If you change the 5.7 to another value, you still get the same absolute difference of maximum and minimum values. Relative error depends on the value you are comparing to. e.g. 5.7 ± 10% would be between 5.7 - 0.57 and 5.7 + 0.57 = 5.13 to 6.27. The absolute difference of maximum and minimum would change if the main number changes. e.g. 11.3 ± 10% would be between 10.17 and 12.43, which has a greater absolute difference of maximum and minimum than the previous example. [[User:Nutster|Nutster]] ([[User talk:Nutster|talk]]) 01:54, 18 April 2020 (UTC)

Are all of these equations consistent with garbage = infinity?
: Unfortunately, as written, these equations would not make sense by defining Garbage as an infinity. Infinity is not a number you can count to or measure in between integers. Infinity is the idea of unending-ness. Trying to use infinity as if it a finite number yields all sorts of invalid results. In this case Garbage is defined as an arbitrary finite number with a large amount of uncertainty in its value. [[User:Nutster|Nutster]] ([[User talk:Nutster|talk]]) 01:40, 18 April 2020 (UTC)
::: That's a pretty good definition of 'garbage' in ''any'' case, plus or minus 10%. ( See also [https://www.weforum.org/agenda/2017/06/landfill-mining-recycling-eurelco/ valuable garbage]) [[User:Iggynelix|Iggynelix]] ([[User talk:Iggynelix|talk]]) 14:19, 18 April 2020 (UTC)

Would the summation divided by ''n'' just give you the arithmatic mean of the data set? [[User:Nutster|Nutster]] ([[User talk:Nutster|talk]]) 01:55, 18 April 2020 (UTC)
:Pretty much, but the point is probably more that (without consistent bias across the set, just 'random' errors for each item) it suppresses the degree of garbagicity as outliers are increasingly nullified by the greater number of more competently accurate values and (if it's a symmetric error) opposing outliers. [[Special:Contributions/162.158.34.222|162.158.34.222]] 09:29, 18 April 2020 (UTC)

The statement that NaN^0 isn't fully justified and I'm not clear it belongs. [[User:Djbrasier|Djbrasier]] ([[User talk:Djbrasier|talk]]) 18:46, 18 April 2020 (UTC)
: I agree... It also isn't evident to me that this comic has anything to do with floating-point math, which is the only thing that could (even slimly) justify its inclusion. This is about statistics, not programming. --[[Special:Contributions/108.162.215.12|108.162.215.12]] 05:25, 19 April 2020 (UTC)

I'm concerned that, with "Precise Number" there's the usual confusion between Accuracy and Precision (''edit: and of course Resolution, too!''). A precise number can still be utter garbage, as 84.7489327(646475)% of all mathematicians could tell you. [[Special:Contributions/162.158.111.241|162.158.111.241]] 13:59, 19 April 2020 (UTC)