SERIAL
Slave serial number

Availability
1850: Both samples
1860: All three samples

Universe
All persons.

Description
SERIAL is an identifying number, unique to each slave holding in the sample. All slaves in a given holding are assigned the same serial number. (Slave records also have their own unique identifiers -- see SLAVENUM.) A combination of YEAR, DATANUM, and SERIAL provides a unique identifier for every slave holding in the Slave samples; YEAR, DATANUM, SERIAL, and PERNUM uniquely identify every individual in the database.