^ Yes, as I stated above, “I do think family income, selectivity, rigor, and prestige all influence graduation rates.” Multiple factors must be influencing the graduation rates. St. Olaf isn’t more selective than Michigan-AA. I don’t think Beloit is more selective than UT-Austin. UChicago is not clearly more selective than Stanford, which seems to have a much higher median family income ($167,500) and also a much lower 4 year graduation rate (75%). Granted, we’d need to look at patterns across a lot more data than these few ad hoc examples.
FWIW, here is the above table with ACT scores added:
Median Income … 4Y GR … ACT … School
$30,000 … 49% … 24 … Berea College (LAC)
$58,000 … 25% … 25 … University of Houston
$58,700 … 69% … 22 … Spelman College (LAC)
$75,300 … 32% … 24 … Liberty University
$106,600 … 59% … 25 … Drew University (LAC)
$115,400 … 52% … 26 … Michigan State
$110,900 … 75% … 27 … Beloit College (LAC)
$123,900 … 58% … 29 … UT Austin
$140,400 … 85% … 29 … St. Olaf College (LAC)
$154,000 … 76% … 31 … Michigan AA
$172,400 … 89% … 31 … Carleton College (LAC)
$180,700 … 73% … 30 … Tulane
$134,500 … 88% … 34 … UChicago
In 5 out of 6 pairs, family income and test scores together fail to predict the higher graduation rate.
ACT score source: prepscholar