Academic standards and student achievement study

There is no correlation between states that raise academic standards and actual improvements in student achievement, researchers report. Researchers say the issue could be related to other factors, including a lack of educational resources or the end of No Child Left Behind.
Hamlin, D., & Peterson, P. (2018). Have states maintained high expectations for student performance? Education Next. https://www.educationnext.org/have-states-maintained-high-expectations-student-performance-analysis-2017-proficiency-standards/.