Centered Moving Averages (CMA)

The Centered Moving Average is a specific form of Centered Weighted Moving Average, where the smoothing constants are the same, except for the start and end if the length is an equal number.

Name	α0	α1	α2
2 CMA	0.5	0.25
3 CMA	0.333	0.333
4 CMA	0.25	0.25	0.125
5 CMA	0.2	0.2	0.2

The weight function for CMA is defined by specifying the number of calculation periods (>=2).