Jandila comments on 2012 Survey Results - Less Wrong
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Problem:
The line: "This includes all types with greater than 10 people. You can see the full table here." links to a gif that is inaccurate, has no key to explain oddities, and is of such poor graphical quality that parts of it are actually unreadable.
It may be that the reason that invalid personality types like "INNJ" are listed is due to typos on the part of the survey participants. If so, then great! But it may also be that the person who constructed this graphic put typos in (I consider this fairly likely due to the fact that the graphical quality is so low that some of it's not readable. For instance, the number of INTPs is so unclear I can't even tell what it says - it looks like 113 but your results in the post claim 143). It isn't obvious why the invalid types are there, so a key or note would be nice.
Also, some of the participants had a good idea: if one of your personality dimension letters changes when taking the test multiple times, you can fill it out with an X. Can we add an instruction for them to do this on the next survey?
I don't take this test all too often (in fact, didn't take the one in the survey IIRC), but if we can do this, here's my personality type: IXXX. Oh wait.
(Yes, seriously, if I take an online MBTI test several times at evenly spaced time intervals within the same month, the first varies between .6 and .95 towards I, and the others just jump around in a manner I can't predict (yet, anyway, probably could eventually if I did more timewasting internet-test-taking))
I predict similar (perhaps less pronounced?) variation would be present in around 30% of LWers (not too confident in this number), and that we could reduce the variation dramatically by eliminating confused questions and tabooing ambiguous or vague words / phrases, replacing them with multiple questions containing various common meanings, and an even greater (bitwise) reduction by giving more contextual information from which the respondent can infer or judge values and weight variables on "It depends, but I suppose most of the time I would..." -type answers. (much more confident in these last two predictions than the first)
The graphic was automatically generated by a computer program, so there's no chance that typos were introduced. There's no key to explain oddities because I have no way of knowing the explanation any better than you. When in doubt, blame survey takers being trolls.
But I do apologize for the poor graphic quality.