/sci/ - Science & Math

>>10364209
Bermuda:
>Sandoval et al. (1983 ) take their data from an unpublished doctoral dissertation (Astwood, 1974). I have requested this document from its University library, and I will update this post in the future if it contains any data unreported by Sandoval. Lynn incorrectly reports the sample size from this paper, which is 92, not 161.

>Lynn reports a sample size of 125 for this study. But some of the children dropped out or died, so the child sample is actually 117. Further, the mothers were also tested with the vocabulary subtest of the Wechsler Adult Intelligence Scale, so there is additional data here for 117 more people. Lynn reports an IQ of 92, but the IQ scores reported in this paper are nowhere close to this number. The SBIS IQs are actually reported as 106.6 for the treatment group and 103.1 for the control group (p. 539). If we apply a Flynn adjustment of 2 points, this gives us an IQ of 101 for the control group. The maternal scores on the WAIS subtest were significantly lower. The MCHP treatment program showed no significant effects on child intelligence.

Africa:
Jelte M. Wicherts, Conor V. Dolan, Han L.J. van der Maas, The dangers of unsystematic selection methods and the representativeness of 46 samples of African test-takers, Intelligence, Volume 38, Issue 1, 2010, Pages 30-37, ISSN 0160-2896, http://dx.doi.org/10.1016/j.intell.2009.11.003
>In light of all the available IQ data of over 37,000 African test-takers, only the use of unsystematic methods to exclude the vast majority of data could result in a mean IQ close to 70. On the basis of sound methods, the average IQ remains close to 80. Although this mean IQ is clearly lower than 100, we view it as unsurprising in light of the potential of the Flynn Effect in Africa (Wicherts, Borsboom, & Dolan, 2010) and common psychometric problems associated with the use of western IQ tests among Africans.