I have developed custom Standard Deviation based on different average like the:

1. Geometrical average

2. Harmonic average

3. Quadratic average

As shown in the attached pic, i would like to understand why, for the same Period:

1. The Regular Stdev is almost equal to the Harmonic StdDev

2. The Geom Stdev is almost equal to the Quadratic StdDev

It's more like a maths problem but i would be interested to have a feedback...

Thanks

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