환웅 데이터
10/21/2022 Stat20 Class Note 본문
NAEP
Target population:
- 4th, 8th, 12th grades in United States
Access frame:
- public: comprehensive list by NCES
- private: list from private school universe (PSR)
Sample:
- public: 100 grade-eligible public schools per state
- private: 700 schools chosen nationally
- sampling unit: one school
Unit of observation:
one 4th, 8th or 12th grader
Coverage bias.