From the New York Daily News:
While the 2.3 times number is much more accurate than the claims put forward by Slate and Pro Publica, we have argued that even this number is misleading. Only 1.2 percent of police departments that report this data are from very heavily black areas. Indeed, the rate of percentage of the population that is black living in the areas represented by these police departments is about twice the share of their share of the population nationally. Thus it isn’t clear that black male teenagers are actually killed at a higher rate than white male teenagers by police.