{"kind":"assistant","text":"Stock and Watson's class-size regression: OLS of district test scores on the student-teacher ratio, heteroskedasticity-robust (HC1) errors.","tool_calls":[{"args":{"controls":[],"dataset":"caschool","fe":[],"se":"HC1","x":["str"],"y":"testscr"},"id":"script_1","name":"infer__ols"}]}