Unlike previous research, Schmidt analyzed the link between states with standards that were similar to the CCSS and their NAEP math scores. He used cut scores aligned to NAEP as a proxy to determine if states were serious about high expectations and implementation of standards. The preliminary results showed states with standards in line with CCSS combined with higher cut scores also had higher NAEP scores.
I don't think the whole study is online, but I was not reassured by the chart which shows a five level rating of "Consistency with the CCSSM" where Vermont is at 3, New Hampshire at 2 and Rhode Island at 1. That'll help get the results described above, but it is objectively bogus.
Also, Dan might be surprised that Callifornia gets a 5 and Massachusetts gets a 3.