Columbia subject headings:
Harvard subject headings:
Absenteeism (Labor)--Mathematical models.
Absenteeism (Labor)--United States--Mathematical models.
Paper industry workers--United States--Mathematical models.
Paper industry workers--United States.
Wages and labor productivity--Mathematical models.
Wages and labor productivity--United States--Mathematical models.
Princeton subject headings:
Absenteeism (Labor)
Labor productivity.
Wages.