A query to the selected PitchTier object.
the standard deviation in the curve within a specified time window.
The curve consists of a sequence of line segments. The contribution of the line segment from (t1, f1) to (t2, f2) to the variance-multiplied-by-time is
|[ 1/4 (f1 + f2)2 + 1/12 (f1 – f2)2 ] (t2 – t1)|
The standard deviation is the square root of: the sum of these values divided by toTime – fromTime.
To get the standard deviation in the points only, i.e. not weighted by the durations of the line pieces, Use PitchTier: Get standard deviation (points)... instead.
© ppgb, August 21, 2001