reference for previous value of an attribute

Hello

The Differentiate operator in the value series extension might give you something to start with

regards

Andrew

Thanks Andrew,
i have to use in the formula attributes of the same example but from differents time series?
for example i have to calculate a percent variation between more than one attribute of the preview or following rows?
To explain, In excel being in row number 2 to on the column c (C2) i should calcutate something like = (A1-B1)/B1*100
How to implement it in Rapidminer (using pure RM or by Series Extension)?
Is there any user manual of series extensions?

Hello Robben

I get it - you could try the Lag Series operator. Here's an example

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.008">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.008" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="generate_data" compatibility="5.3.008" expanded="true" height="60" name="Generate Data" width="90" x="45" y="30">
        <parameter key="number_of_attributes" value="3"/>
      </operator>
      <operator activated="true" class="generate_attributes" compatibility="5.3.008" expanded="true" height="76" name="Generate Attributes" width="90" x="179" y="30">
        <list key="function_descriptions">
          <parameter key="newAtt" value="(att1-att2)/(att3*100)"/>
        </list>
      </operator>
      <operator activated="true" class="series:lag_series" compatibility="5.3.000" expanded="true" height="76" name="Lag Series" width="90" x="313" y="30">
        <list key="attributes">
          <parameter key="newAtt" value="1"/>
        </list>
      </operator>
      <connect from_op="Generate Data" from_port="output" to_op="Generate Attributes" to_port="example set input"/>
      <connect from_op="Generate Attributes" from_port="example set output" to_op="Lag Series" to_port="example set input"/>
      <connect from_op="Lag Series" from_port="example set output" to_port="result 1"/>
      <connect from_op="Lag Series" from_port="original" to_port="result 2"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
      <portSpacing port="sink_result 3" spacing="0"/>
    </process>
  </operator>
</process>

regards

Andrew

Hi Andrew,
thanks a lot. I will check your solution
Roberto