Title: On the hypothesis that this site selects for certain personality types that are different from the general population, I decided to run some simple statistics on the results of yesterday's MBTI poll (http://news.ycombinator.com/item?id=943722).<p>I compared the frequencies of each of the types to the population means on the Wikipedia article (http://en.wikipedia.org/wiki/Myers-Briggs_Type_Indicator#Type_dynamics_and_development). The results show that we are a very atypical group indeed:<p><pre><code>  Using a binomial test at a 99% confidence level.
  ISTJ is significant:      1.82% ( 12/660) vs. 11.60% expected.
  ISFJ is significant:      0.61% (  4/660) vs. 13.80% expected.
  INFJ is NOT significant:  2.12% ( 14/660) vs.  1.50% expected.
  INTJ is significant:     31.21% (206/660) vs.  2.10% expected.
  ISTP is significant:      2.42% ( 16/660) vs.  5.40% expected.
  ISFP is significant:      0.15% (  1/660) vs.  8.80% expected.
  INFP is significant:      8.48% ( 56/660) vs.  4.30% expected.
  INTP is significant:     28.94% (191/660) vs.  4.30% expected.
  ESTP is significant:      0.45% (  3/660) vs.  4.30% expected.
  ESFP is significant:      0.15% (  1/660) vs.  8.50% expected.
  ENFP is significant:      3.33% ( 22/660) vs.  8.10% expected.
  ENTP is significant:      8.48% ( 56/660) vs.  3.30% expected.
  ESTJ is significant:      1.36% (  9/660) vs.  8.70% expected.
  ESFJ is significant:      0.76% (  5/660) vs. 12.30% expected.
  ENFJ is NOT significant:  2.27% ( 15/660) vs.  2.40% expected.
  ENTJ is significant:      7.42% ( 49/660) vs.  1.80% expected.
</code></pre>
The data are up-to-date as of about 20 minutes ago. Here's the script I used to generate these results: http://gist.github.com/236850<p>EDIT:<p>Here are the results broken down by pairs:<p><pre><code>  FP is significant:     12.12% ( 80/660) vs. 29.70% expected.
  TP is significant:     40.30% (266/660) vs. 17.30% expected.
  FJ is significant:      5.76% ( 38/660) vs. 30.00% expected.
  NJ is significant:     43.03% (284/660) vs.  7.80% expected.
  NF is NOT significant: 16.21% (107/660) vs. 16.30% expected.
  TJ is significant:     41.82% (276/660) vs. 24.20% expected.
  NP is significant:     49.24% (325/660) vs. 20.00% expected.
  NT is significant:     76.06% (502/660) vs. 11.50% expected.
  EN is significant:     21.52% (142/660) vs. 15.60% expected.
  EJ is significant:     11.82% ( 78/660) vs. 25.20% expected.
  IP is significant:     40.00% (264/660) vs. 22.80% expected.
  IS is significant:      5.00% ( 33/660) vs. 39.60% expected.
  EF is significant:      6.52% ( 43/660) vs. 31.30% expected.
  IT is significant:     64.39% (425/660) vs. 23.40% expected.
  IJ is significant:     35.76% (236/660) vs. 29.00% expected.
  IN is significant:     70.76% (467/660) vs. 12.20% expected.
  ET is NOT significant: 17.73% (117/660) vs. 18.10% expected.
  EP is significant:     12.42% ( 82/660) vs. 24.20% expected.
  ES is significant:      2.73% ( 18/660) vs. 33.80% expected.
  IF is significant:     11.36% ( 75/660) vs. 28.40% expected.
  SP is significant:      3.18% ( 21/660) vs. 27.00% expected.
  ST is significant:      6.06% ( 40/660) vs. 30.00% expected.
  SJ is significant:      4.55% ( 30/660) vs. 46.40% expected.
  SF is significant:      1.67% ( 11/660) vs. 43.40% expected.
</code></pre>
Apparently, 76% of Hacker News is an NT type of one type or another. I've updated the Gist link above with the code that computes this.
Upvote: