Exhibits Vol 2 - Independent Pilots Association

70 FLETCHER ET AL.
Finally, time-series regressions were performed between the
hourly performance on each test and the predictions derived
from the work-related fatigue model. Time series analysis was
performed to assess whether the circadian phase of
performance as predicted by the model was consistent with the
actual performance phase as observed in the collected data.
Statistical analysis between the regressions at a phase lag of
zero and at the phase lag at maximum correlation would
normally be performed to assess whether the phase differences
make a statistical difference to the relationship, however this
was not achievable as the duration of data collection was
insufficient (i.e.,