Simple preprocessing methods

Contemno

Hello there,

I'm looking for simple preprocessing methods.
Maybe I'm just blind but I can't find anything that matches my criteria.

1. A simple recoding.
For example produce an atrribute B out of an existing attribute A (containing values from 1 to 5) by the following rules:
A: 1,2 --> B: 1
A: 3,4 --> B: 2
A: 5 --> B: 3

2. A simple condition-knot.
For example produce an attribute B out of an existing attribute A (containing ages of humans) like this:
A: 1-18 / to 18 --> B: 1 or "young"
A: 19-40 --> B: 2 or "midage"
A: from 41--> B: 3 or "old"

Thank you in advance.
Greets from the baltic sea,
Sebastian L.

land

Hi Sebastian,
there is a simple operator called UserBasedDiscretization what exactly does what your are searching for. To solve your second problem you might edit the list as follows:
First line is called young and its upper limit is 18. So the interval will be negative infinity to 18
Second line is called midage and its upper limit is 40. The interval will be >= 18 and < 40.

This would look like tihs in XML

          <parameter key="young"	value="18.0"/>
          <parameter key="midage"	value="40.0"/>
          <parameter key="old"	value="2000.0"/>

To solve the first problem you could make use of UserBasedDiscretization and another operator called NominalNumbers2Numerical. I think you can quite comprehend what this leads to Just enter as new value a number like "1" or "2" and then use this operator to change that attribute into a numerical one, if you need it numerical. If you need to process changes only on one or a few of all attributes, use AttributeSubsetPreprocessing, to select the attributes the inner operators should work on.

Hope I could help,
  Greetings Sebastian