An S factor among census tracts of Boston

Abstract A factor analysis was carried out on 6 socioeconomic variables for 506 census tracts of Boston. An S factor was found with positive loadings for median value of owner-occupied homes and average number of rooms in these; negative loadings for crime rate, pupil-teacher ratio, NOx pollution, and the proportion of the population of ‘lower…

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The sibling control design

A friend of mine and his brother just received their 23andme results. In a table they look like this (I have added myself for comparison): Macrorace Bro1 Bro2 Emil European 52.6 53 99.8 MENA 42.5 41.3 0.2 South Asian 2.8 3.4 0 East Asian & Amerindian 1.1 0.7 0 Sub-Saharan African 0.5 0.5 0 Oceanian…

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Tox, a decent alternative to Skype etc.

This post is severely outdated, and only kept here for historical reasons. For years I have looked for a good alternative to Skype. Skype has some nice features including: Group conversations Voice and video chat A chat history Good interface Ease of use It also have some nasty features I diswant: Closed source Ads NSA…

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Installing an RStudio server on DigitalOcean

Not as easy as claimed, but not that difficult. I used the default values and stuff with Ubuntu like in the guide. Some difficulties: Had to learn SSH Just read this. No email was sent with password Apparently, this is not done when using SSH, see above guide. Don’t skip making a second user If…

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Why do persons from higher mean IQ populations do better even after selection?

Abstract It has been found that workers who hail from higher socioeconomic classes have higher earnings even in the same profession. An environmental cause was offered as an explanation of this. I show that this effect is expected solely for statistical reasons. Introduction Friedman and Laurison (2015) offer data about the earnings of persons employed…

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DMCA for Lewontin’s fallacy (paper)

DMCA email: VIA EMAIL: Demand for Immediate Take-Down: Notice of Infringing Activity Date:      April 24, 2015 URL:      http://filepost.com/ Dear Sir or Madam, We have been made aware that the domain listed above, which appears to be on servers under your control, is offering unlicensed copies of, or is engaged in other unauthorized activities relating to…

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