Quote: MH: This is handwaving move. Not argumentation. Remember we are talking about the Millennium data. For what I have read, that data is no joke. You can't dismiss it like this.
This is the best recent data point there is. The sample is not perfect but it is much better than those typically cited by Lynn. Speaking of which, in context to the Wave 3 results, Lynn and Cheng said:
"Second, the three groups of Africans obtained lower IQs than the whites with IQs of 96.68 (Black Caribbeans), 90.02 (Black Africans) and 91.95 (Other Blacks). These IQs are higher than those in the 22 previous studies summarised by Lynn (2006) in which Africans obtained a median IQ of 86. These results suggest that the intelligence of Africans has increased relative to that of whites in recent years.
However, this apparent improvement may be in part attributable to the young age at which the children were tested."
And they were wrong. Instead of increasing with age the U.K B/W gaps decrease in line with a genetic difference hypothesis of 0.
(2014-Aug-26, 03:45:56)menghu1001 Wrote: I believe Chuck is making a big fuss, more than this subject deserves. Just saying the BW gap is small in the UK without an interpretable environmental explanation cannot be accepted as an argument for environmental hypothesis. At the same time, Chuck failed to find any plausible explanation of the trend (if my memory is correct). So he is still asking a question worth answering.
It's not just that it's small, it's that there was a marked
secular evaporation at least when we place birth cohort on our x axis and trust Lynn's data.
As for the survey, technical information can be found
here. Two other cognitive related tests were given: CANTAB Spatial Working Memory (Memory task) and CANTAB Cambridge Gambling Task (Decision making task). But I have no idea about the psychometric properties of these or how to compute standard scores for them (which aren't give). We do know, however, that similarities are a fair measure of g and that there is a moderate to large US B/W gap in these.
Regarding MH's claim that I need an explanation, I do not believe that I do. A hereditarian hypothesis predicts differences. Lynn rightly pointed out:
Quote:The evolutionary theory does however predict that when different races occupy approximately similar environments, such as for instance in the United States, Britain and the Netherlands, the intelligence differences will remain. This prediction has been examined in twenty three societies worldwide in Lynn (2008) and has been confirmed in every case. If a multiracial society is found where these race differences in intelligence are absent, the evolutionary and genetic theory of these differences would be falsified. Those who maintain that there are no genetic differences in intelligence between the races are urged to attempt this task. (Consistency of race differences in intelligence over millennia: A comment on Wicherts, Borsboom and Dolan)
The fact that White and Black youth in the UK now show diminishing differences argues against a hereditarian hypothesis. Pointing out the consistent differences in the US -- which of course I am well aware of because I've conduced the most recent meta-analyses on these! --doesn't negate this, since these differences are in the US and can plausibly be explained by societal factors.
Generally, I would suggest that the US difference is more resilient because there are more Blacks; thus it's more difficult to lift them up. In the UK the black population if smaller at 3% and thus more amendable to environmental intervention.
Quote:Then there's the entire failed history of trying to raise g thru compensatory education. Pretty much a big failure. It works for children, maybe (negative g-loading, cf. Nijenhuis et al, 2014). It fizzles out.
Has it ever been shown that the UK B/W gaps are g-loaded? If it has, we now have a good counter-example.
Look, it's not as if this is an isolated finding from the U.K. I pointed to
math and reading and GCSE results
two years ago. It was argued then that the math and reading scores, ones which were found to be under substantial genetic influence in the whole population, didn't well index IQ, so I said that I would look for youth IQ data, which I did. And here it is. Of course, I also looked at PISA scores for Black African British immigrants (e.g., attached) and I found similar non-results if based on tiny same sizes (but of course Lynn has cited samples as low as n=9!).
I will take as counter evidence Dutch Cito Scores from 2012 on, since we are basically dealing with similar populations e.g., Dutch Antilleans/ Black British Caribbeans. I can't make heads or tails of the recent Jaarrapporten, which should report these. In absence of evidence of a significant Holland gap I will attribute the high U.S. Black immigrant/White gaps to 10th generation U.S. Black undertow and declare the HH disconfirmed. If it can be shown that there are still large Holland gaps, I will rethink my position above -- and entertain the possibility of a UK psychometric conspiracy to cover up gaps.
Anyone who isn't troubled by the totality of the UK evidence regarding the B/W gap isn't being intellectually honest.
(2014-Aug-26, 03:45:56)menghu1001 Wrote: I believe Chuck is making a big fuss, more than this subject deserves. Just saying the BW gap is small in the UK without an interpretable environmental explanation cannot be accepted as an argument for environmental hypothesis. At the same time, Chuck failed to find any plausible explanation of the trend (if my memory is correct). So he is still asking a question worth answering.
I. My explanation is: The UK is a totalitarian PC country that has devoted great energy to eliminating race differentials. And they have, over time, with use of positive discrimination. The hypothesis predicts:The B/W cognitive ability gap has been narrowing across age cohorts. It existed prior and it can be found among adults, testifying that Black immigrants weren't just super duper selected. (This hypothesis predicts, for example, that NART/PIAAC d-values -- from the samples I showed you -- should positively correlate with age.)