 What is one reason the author thinks the regression analysis used by Murray and Herrstein was inadequate?
The Bell Curve Flattened Charles Murray is a publicity genius, and the publication of his and Richard Herrnstein's book, The Bell Curve: Intelligence and Class Structure in American Life , in the fall of 1994 was his masterpiece. Another handpicked group was flown to Washington at the expense of the American Enterprise Institute and given a weekend-long personal briefing on the book's contents by Murray himself (Herrnstein had died very recently), just before publication. Herrnstein and Murray didn't do this, so it wasn't until a full year or more after The Bell Curve was published that the leading experts on its subject had a chance to go through the underlying data with care.
 The tests relied upon in the database were not truly IQ tests.
 The results were able to be duplicated by other social scientists.  The independent and dependent variables were clearly defined.  The tests relied upon in the database were not truly IQ tests.  The sources relied upon were balanced and reliable.