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# 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.

0

## Answers

2,531Unicornactually 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