Wikipedia describes The Equity Project as
The Equity Project (TEP) is a New York charter school opened in September 2009. The school will instruct students in fifth through eighth grades and will pay its teachers a starting salary of $125,000 per year, more than double the national average. Teachers must also work double the hours a typical teacher works.Now Vox reports that This school paid teachers $125,000 a year — and test scores went up
Four years later, students at TEP score better on state tests than similar students elsewhere. The differences were particularly pronounced in math, according to a study from Mathematica Policy Research released in October. (The study was funded by the Gates Foundation.) After four years at the school, students had learned as much math as they would have in 5.6 years elsewhere: ...Intriguing...and a hopeful sign generally. It should be noted, however, that I got to that report from the link at statistics-prof Andrew Gelman's blog on Time-release pedagogy?? - Statistical Modeling, Causal Inference, and Social Science
... Teachers at TEP also get more time to collaborate and played a bigger role in school decision-making than teachers in other jobs. Teachers were paired up to observe each others' lessons and provide feedback, collaboration that experts agree is important but happens too infrequently. During a six-week summer training, teachers also helped set school policy.
The workload at TEP, where teachers also take on administrative duties and had an average of 31 students per class, is fairly heavy even with the extra pay. But the school also had more teacher turnover than usual. Nearly half of first-year teachers didn't return for their second year, either because they resigned or because they were not rehired.
...there’s something strange here or i’m missing something obvious. That jump from 3-year impact to 4-year seems excessive.That does seem really odd. Still, it's a hopeful sign.