Variance in Statistics interface
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?
Or is the next?
Thanks.
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?
Or is the next?
Thanks.
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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