﻿ Regression to the Average
 Regression to the Average Washington, DC, is the classic example of "regression to the average".   While they spend \$8,888/year per student for education, almost the highest of any state, they consistently score lower than every state on every test they participate in. But this is only because 83% of their students are blacks, 10% are Hispanics, and only 4% are Whites.  Ironically, this  high level of spending for education apparently benefits Whites in Washington because 61% of them are proficient at math, which is higher than the national average for Whites of 30%. But it doesn't benefit blacks at all, because only 2% of blacks in Washington are proficient at math, which is half the national average for blacks of 4%.  Conversely, in states where blacks are less than 5% of the population, like Alaska, Arizona, Colorado, Hawaii, Iowa, Maine, Nebraska, New Mexico, etc., the percent of blacks who are proficient at math is more than double the percent in Washington who are.  Only 5% of Colorado's studens are blacks but 8% of them are proficient in math--four times the percent in Washington, DC. West Virginia has the lowest scoring Whites in the nation, with only 15% of them proficient in math, and spends almost  as much for education as Washington, DC (\$6,346 per  student), but only 2% of the black students there are proficient at math. Not being around other blacks is more important to their education than spending more money.  The states which spend the most for education and have the highest percent of blacks have the worst educated blacks, while the ones which spend the least and have the least percent of blacks have the best educated blacks. btw, this is not a proposal.   From "Race, Evolution, and Behavior: A Life History Perspective", J. Philippe Rushton `Regression to the Average````Regression to the Average provides still another way to test if race differences are genetic. The children of very tall parents are taller than average. But they are shorter than their parents and nearer the average of their race. Similarly, children of very short parents are shorter than average, but taller than their parents. This is called the Law of Regression to the Average. It is not true just for height, but for IQ as well. Most physical and psychological traits show some regression effect.``````Regression to the Average happens when very tall (or very high IQ) people mate because they pass on some, but not all, of their exceptional genes to their offspring. The same thing happens with very short (or very low IQ) people. It's like rolling a pair of dice and having them come up two sixes or two ones. The odds are that on the next roll, you'll get some value that is not as high (or as low).``````Here's why regression is important to our studies. Because Whites and Blacks come from different races, they have many different genes. The Law of Regression predicts that for any trait, scores will return to the average of their race. The Regression Law predicts that in the U.S., Black children with parents ofIQ115 will regress toward the Black average of 85, while White children with parents of IQ 115 will regress only toward the White average of 100.``````The law also works at the other end of the scale. Black children with parents of IQ 7Q will move up toward the Black average IQ of 85, but White children with parents of IQ 70 will move further up toward the White average of 100. When we test these predictions about Regression to the Average from parent to child they prove true.``````The Regression Law also works for brothers and sisters. Black and White children matched for IQs of 120 have siblings who show different amounts of regression. Black siblings regress toward an IQ of 85, while White siblings regress only to 100. The opposite happens at the lower end of the scale. Black and White children matched for IQs of 70 have siblings who regress differently. Black siblings regress toward an average of 85, whereas White siblings move to 100.``````Regression to the Average explains another interesting finding. Black children born to rich parents have IQs that are two to four points lower than do White children bom to poor parents. The high IQ Black parents were not able to pass on their IQ advantage to their children even though they did give them good nutrition, good medical care, and good schools. Only genes plus environment tell the whole story.```