This is Europe, though, and Communist governments tend to be big on education.
It is one of the poorest parts of Europe, and Communist governments tended to be big on a lot of things they couldn't deliver.
Within which population? The control group involves one parent "from the outside", so regression to the mean kicks in and the chance of the recessives finding a pair falls dramatically.
If you're comparing within an Indian population, then the much higher rates of inbreeding aren't the confound; all you have is the remaining selection effect, and that's must be small because anything else would drastically contradict the animal and other breeding experiments, and the estimates from genomic methods.
I am arguing that if you take children of incestuous unions where both parents have reasonable IQ (say, >85), the mean IQ of children would NOT drop by 28 points.
It would probably drop by more like 25 points, looking at the weighted averages. (For the surviving children, that is.)
It is one of the poorest parts of Europe, and Communist governments tended to be big on a lot of things they couldn't deliver.
Communist governments delivered on that one.
Take a look here, specifically pages 21 and 23. The secondary education in Eastern Europe was more prevalent than in Mediterranean countries and Great Britain + Ireland (but less than in Nordic countries and Central Europe). And Czechoslovakia was one of the better Eastern European countries.
If you're comparing within an Indian population
I went and looked at the Jammu & Kashmir ...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.