identity = {
    # https://www.census.gov/prod/cen2010/briefs/c2010br-03.pdf
    'sex': [('M',49.2),('F',50.8)],

    # https://en.wikipedia.org/wiki/Race_and_ethnicity_in_the_United_States
    'race': [('O',72.4),('U',12.6)]
}

iq = {
    # Class: (mu, sigma)
    # http://www.iqcomparisonsite.com/sexdifferences.aspx
    'M': (103.08, 14.54),
    'F': (101.41, 13.55),

    # http://isteve.blogspot.com/2005/12/do-black-women-have-higher-iqs-than.html
    # See the URL above for the provenance of the figures. As heritable measures of IQ,
    # they are probably mostly garbage. But they provide a representative basis for a
    # certain kind of "scientific" view of the world. And they were the only ones
    # I came across that broke down mu and sigma values by sex and race. 
    'UF': (90.8, 13.58),
    'UM': (88.4, 13.30),
    'OF': (103.6, 13.30),
    'OM': (102.7, 14.75)
}
    # https://commons.wikimedia.org/wiki/File:WAIS-IV_FSIQ_Scores_by_Race_and_Ethnicity.png
    'O': (103.21, 13.77),
    'U': (88.67, 13.68),
