normalization operator

brianbaker

Is there an operator to transform values to a mean set to zero and confine the range to be within -1 to 1?

I've tried the GaussAttributeGeneration, but it doesn't give any spread; all values come out 0.  Is this the way it was intended to be used?

    <operator name="GaussAttributeGeneration" class="GaussAttributeGeneration" breakpoints="after">
        <parameter key="attribute_name" value="BMI"/>
    </operator>

Thanks!

land

Hi,
if you want to normalize your values, you will have to use the Normalization operator. It offers an option "Z-transformation" which will scale the data in a way, that the mean becomes zero and the standard deviation is 1.

And no: The GaussianAttributeGeneration will return the density value of a gaussian function with the specified mean and deviation on the position of the attribute value. Probably your attribute value is very high, so that it becomes nearly zero.

Greetings,
  Sebastian