Weighted Average
subtopic to measurement
[under construction]
Bi-Directional Average
An average ratio of two numbers, similar within a factor of 2x, exists either arithmetically or geometrically as, (a/b)-(b/a) / 2 or sqrt( (a/b)+(b/a)-2 ). [I've used this when comparing planets twinning: for example Venus:Earth is .82:1.0 for 1.22-.82/2 = 20%]
[under construction]
© 1996 GrandAdmiralPetry@Lanthus.net