> The problem is student outcomes aren't linked to how much money and resources the school has, they're linked to how much money and resources the parents (and the network of the parents) of the children have.
The consistent positive outcomes of disadvantaged students in KIPP Academies would suggest this is not always the case.
The authors of The Charter School Dust-Up said that KIPP's admission process self-screens for students who are motivated, compliant, and come from similarly motivated, compliant and supportive families. The 2010 Mathematica Policy Research study found that KIPP schools had a "lower concentration of special education and limited English proficiency students than the public schools from which they draw".[22]
Some KIPP schools show high rates of attrition, especially for those students entering the schools with the lowest test scores. A 2008 study by SRI International found that while KIPP fifth-grade students who enter with below-average scores significantly outperform peers in public schools by the end of year one, "60 percent of students who entered fifth grade at four Bay Area KIPP schools in 2003–04 left before completing eighth grade",[23] although research on attrition at one KIPP school in Massachusetts differs.[24] The SRI report also discusses student mobility due to changing economic situations for student's families, but does not directly link this factor into student attrition. Figures for schools in all states are not readily available.
Of course KIPP selects for motivated students. But it also selects for severely disadvantaged students. So while it's true that we can't assume KIPP's results can be generalized across the entire population, we know that additional school resources works in a subset.
The consistent positive outcomes of disadvantaged students in KIPP Academies would suggest this is not always the case.