Dataset:  atc_error_ageexp.dat

Source: D. Broach and D.J. Schroeder (2006). "Air Traffic Control
Specialist Age and En Route Operational Errors," The International Journal
of Aviation Psychology, 16(4), pp. 363-373

Description: Count of ATC operational errors by experience and age.
Note: Authors did not use exposure offset and inverted the 8 and 3 in reported deviance (First sentence of Results)

Experience Categories:
1 = <= 3 years
2 = 4-9 years
3 = 10-14 years
4 = 15-19 years
5 = 20-24 years
6 = >= 25 years

Age Categories
1 = <= 55 years
2 = >= 56 years

Variables/Columns
Experience Category   8
Age Category         16
# of operational errors   18-24
ATC population (# operators)   26-32