属性

数据类型ID

必须?Optional

Codes (11)

• 1National Probability Sample
• 2Annual User Norms
• 3State Norms
• 4Regional Norms
• 5Private School Norms
• 6Catholic School Norms
• 7Urban Norms
• 8High Socio Economic Status Norms
• 9Low Socio Economic Status Norms
• AEquated National Norms
• ZMutually Defined