Millions of Hoodies
Behold, a map! I took the results of the hoodies per person survey and MADE A MAP OF HOODIES IN SAN FRANCISCO.
For those tuning in late, here is the original question:
Click for navigable version with pop-ups. (This is the first map I made in TileMill/MapBox, so I basically don’t know what the hell I’m doing, but not to shabby, eh?)
Some hoods are hoodier than others! Sample size for some zips isn’t ideal, but NW SF is leading the pack. Fog trumps fashion, apparently.
(Note this just shows the hoodie decile with the highest value, though that got tricky with some of the zips with low response rates where a bunch of deciles were tied — in that case I tried to pick a reasonable value. (Note: thing I never expected to ever type: “hoodie decile”.))
Unsurprisingly, most responses came from the Mission, Noe, Castro and Hayes Valley. Here’s a heat map of the total responses by zip. (Sorry, don’t know how to make a color-coded legend in TileMill yet. I also haven’t figured out how to clone a map yet, so all you get is this lovely PNG for now.)
But not terribly surprising given Burrito Justice and Mission Mission readership demographics. A table of the response rate by ZIP code:
And a stacked area chart:
To answer @brittneyg’s original question: Can we safely extrapolate? We have a sample size of about 500 responses, with an average of about 4 hoodies per person. I am no Nate Silver, but I think it’s safe to say there are more hoodies than people in San Francisco, especially with that fat tail. If we run with a conservative estimate of 4 hoodies per person, we are looking at over 3 million hoodies in 49 square miles.
Thanks again to @brittneyg, @alexismadrigal, and especially @therealWBTC for the poll!
Burrito Justice 
I think the average *ownship* is 4 hoodies — but if you are talking about existence, there’s at least 1-2 million “San Francisco” hoodies in Chinatown stores.
We explicitly excluded hoodies not yet purchased..
I took the total number of hoodies for the total number of respondents and extrapolated that ratio out to an SF population of 812,826, giving a total SF hoodie population of 3,536,994. I didn’t include children and pets in that total because (1) children are considered people in the population estimate, so they are already accounted for and (2) it’s tough to accurately extrapolate the pet totals without knowing (i) the total number of pets in SF and (ii) the number of hoodie-owning pets per response. However, the responses to that question were not too significant, with 78.9% of those respondents who didn’t skip the question reporting that their children/pets did not own any hoodies.
I would say the fact that your sample shows no hoodies whatsoever in Bayview/Hunter’s Point reveals its basic inaccuracy.
I think you overestimate the seriousness or thoroughness of this poll.
But you are on to something. The more interesting part about this is the response rate (or lack thereof) across ZIP codes — there’s probably a PhD thesis to be written about blog readership and demographics.
Nice. I think we should add hoodie wearers to the next census. I see them everywhere!
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