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The expected squared deviation of a random variable from its mean; or, the average squared deviation of data about their mean.

1
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I thought a few minutes about this problem, and got a feeling that it is not so easy to find nice function class which is able to (i) change its width, (ii) is normalized, and (iii) and takes the valu …
answered Jul 8 '14 by davidhigh
2
votes
$ the split is preferred in the middle. Now, doing the same for the version of the splitting formula which includes the variance, the result is $$y_{VAR}^\ast = -1 - \sqrt{\frac{(N+1)^2}{(N^2+1 … $. Conclusion: The splitting formula using the sum of squares (SS) leads to the more intuitive behaviour that the split is preferred at point (1) in the middle. Instead, the formula with the variance does …
answered Jan 10 '16 by davidhigh
3
votes
I don't think there is a special name for that term. It's just some mathematical expression, $$p_i(x_i - \mu),$$ in which the definition of the mean value has been inserted (--where one should bette …
answered Dec 12 '15 by davidhigh