Variance in Statistics interface

maalvarez
maalvarez New Altair Community Member
edited November 5 in Community Q&A
Hi,

I need help about the variance statistic.
I see that RapidMiner has a statistic interface called Statistics (http://rapid-i.com/api/rapidminer-5.1/com/rapidminer/example/Statistics.html).

This interface has a VARIANCE field, but I unknow the exact definition of this variance.
For example, is this field like the next formula?

image

Or is the next?

image

Thanks.
Tagged:

Answers

  • land
    land New Altair Community Member
    Hi,
    actually these two formula just express the same. The first for the empirical case, where you have a finite number of samples from a distribution and the second one for the theoretical case.
    As RapidMiner just works on the samples of the example set, it uses the first one.

    Greetings,
    Sebastian

Categories