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Let's compare climbing grades I guess
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README.md

compare_grades

Let's compare climbing grades I guess

For those of you that don't know me: I like to rock climb, eat ice cream, and make self depricating jokes. I want to get less fat, so I decided I would eat less Ice Cream. I also want to climb harder. Thus a rule: I woul only eat ice cream if I sent 5.13a or harder. I then made the rules a little bit more structured. The ice cream trip is at the end of a weekend or day (if I'm local). So everything ends up on the same cone, if I somehow manage to climb more than one 13 in a weekend (or my life god). Here are the cone and topping rules:

Grade Reward
5.13a Standard Cone
5.13b Waffle Cone
5.13c Waffle Cone dipped in fudge
5.13d Waffle Cone Dipped in fudge + fudge on top of ice cream

The rules are kinda flexible, if I'm at a shope w/o special waffle cones I just get fudge on the ice cream, or whatever.

Anyway, I'm starting to get into bouldering this year, and want to carry my ice cream rules over. It seemed like there was a lot of debate about VX == 5.Y. So, I did what any wanna be smart kid would do, turned to 8a.nu and wrote some shitty code. We're half way there. To compare the different grades I scrapped the top 1500 sport climbers and boulderers world wide. This was low-key a bit of a pain because you have to use Selenium and Beautiful Soup. Then I threw it all into plotly and boom! an ok graph that you can mouse over.

Then I got curious (read: bored) and decided I would try to add a line with the BMI for sport climbers and boulderers onto the graph. This looked like it would be easy enough, I already had their names and just had to throw the names(replacing the ' ' with a '-') into a url and scrape the table. It obviously couldn't be that easy and was actually kind of a pain. By which I mean it took like 3 hours to get running. You have to send 8a a user-agent to access user profiles (I guess?) and I found one that apparently mimics the chrome one (I guess?). I also had to clean out non-ascii characters, whcich was also a pain. I ended up just kinda not worrying about names with Unicode-8+ characters. If you'd like to add that functionality, please send me a pull request. Getting this data after I got the code working took like 3 hours on a mid-grade computer with a terrible internet connection, plus the 8a servers aren't really that fast.

Anyway. I'm adding the BMI Lines now and might try to figure out how to add more mouse over text to the chart in a while. But then again, maybe I won't who knows what will happen next in the boring life of Mason Caiby?

Some Insights

Looking at the chart, it seems like BMI is a poor predictor for 8a.nu ranking. Which, to some extent, is surprising. Everyone that I know wants to lose weight so they can climb harder. I've definetly felt the effects of a 5 pound weight loss. But, people say that strength is directly correlated with cross-seciontal muscle. Although, at least one study has shown that it is not the only indicator for muscle strength. The loose correlation between BMI and climbing ability is really encouraging to me; I can pursue my Tinder-Bod-2019 and not worry about loss of admiration from the gym bros.....

So I did some polynomial regression (just to the power of 2) and, you cannot predict climbing ability from BMI or BMI from climbing ability (the best R^2 I got was.... 0.0054; this means that 0.5% of the change in BMI is explained by 8a.nu ranking). I honestly didn't think BMI would be very predictive of climbing ability, but was curious to see what the world of 8a had to say about it. And kinda wanted to build the web scraper funcitionality out a bit more. I think that you now have the ability to scrape all of 8a's "allowed" pages.

Also, I thought it was interesting that the route-to-boulder grades relationship wasn't one-to-one. It seems like v7 == 13a, but v10 == 13c. This fits better with my experiences climbing than any other chart I've seen. Maybe I should make a new chart with this data. But I'm not sure what I would want it to look like, so I'm going to hold off on it for now.

Further, climbing ability has an exponential decay; the point difference between the 1001th an 1100th ranked climbers is less than the difference between the 1st and 100th ranked person. However, it looks like there is more consisentcy in the lower ranked sport climbers than boulderers (i.e. sport climbers stay stronger than boulderers).

Some beta on the graph

You can toggle the lines displayed by clicking on them in the legend. You can zoom in and out by drawing a box on the graph, or if you hover near the axis and click-drag parallel to it, it will auto scale the other axis.

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