Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Meta for FE. 1: father’s education level; 2: mother’s education level; HS: high school; JHS: junior high school; PS: primary school; JC: junior college; college; C: college; U: university; MD: master’s degree. (b) Meta for FE. 3: single-child; 4: family income; 2 k: two thousand yuan; 5 k: five thousand yuan.
