User's Manual

B-1
AppENdIx
B
S TATISTIC D EFINITIONS
Statistic Definitions
(In the order, left to right, in which they appear in the statistics table window
when all are selected.)
Start Time
The time at the start of the given Rest, Active, Sleep, Custom, or Daily Interval
(the start of the first epoch in the given interval).
End Time
The time at the end of the given Rest, Active, Sleep, Custom, or Daily Interval
(the end of the last epoch in the given interval).
Interval Duration
The time elapsed between the Start Time and the End Time of the given interval,
in minutes.
Total Activity
The sum of all valid physical activity counts [see Total Invalid Time, below] for
all epochs from the Start Time to the End Time of the given interval.
Average Activity Per Minute
The average of all valid physical activity counts for all epochs from the Start
Time to the End Time of the given interval divided by the Epoch Length in
minutes.
Average Activity Per Epoch
The average of all valid physical activity counts for all epochs from the Start
Time to the End Time of the given interval.
Standard Deviation of Activity
The standard deviation of all valid physical activity counts for all epochs from
the Start Time to the End Time of the given interval. (The standard deviation is
computed with (n – 1) rather than (n) in the denominator of the variance.)
Maximum Activity
The largest of any valid physical activity count for all epochs from the Start Time
to the End Time of the given interval.