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Weights not being calculated

ally_ansari

Hi -

I'm trying to select the weights that were created by the correlations. The correlation works, but the weights are empty.

Do you know what I'm doing wrong?

Screen Shot 2017-12-18 at 6.12.09 PM.png ProcessExample is EmptyWeights are empty Screen Shot 2017-12-18 at 6.13.05 PM.png Correlation works

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earmijo

Use the operator Weight by Correlation instead of the correlation matrix.

Screen Shot 2017-12-18 at 6.31.03 PM.png

Take a look at the attached process.

<?xml version="1.0" encoding="UTF-8"?><process version="7.6.002">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="6.0.002" expanded="true" name="Root">
    <process expanded="true">
      <operator activated="true" class="retrieve" compatibility="7.6.002" expanded="true" height="68" name="Retrieve Polynomial" width="90" x="179" y="136">
        <parameter key="repository_entry" value="//Samples/data/Polynomial"/>
      </operator>
      <operator activated="true" class="weight_by_correlation" compatibility="7.6.002" expanded="true" height="82" name="Weight by Correlation" width="90" x="313" y="136"/>
      <operator activated="true" class="select_by_weights" compatibility="7.6.002" expanded="true" height="103" name="Select by Weights" width="90" x="447" y="136">
        <parameter key="weight_relation" value="less equals"/>
        <parameter key="weight" value="0.4"/>
      </operator>
      <connect from_op="Retrieve Polynomial" from_port="output" to_op="Weight by Correlation" to_port="example set"/>
      <connect from_op="Weight by Correlation" from_port="weights" to_op="Select by Weights" to_port="weights"/>
      <connect from_op="Weight by Correlation" from_port="example set" to_op="Select by Weights" to_port="example set input"/>
      <connect from_op="Select by Weights" from_port="example set output" to_port="result 2"/>
      <connect from_op="Select by Weights" from_port="weights" to_port="result 1"/>
      <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>

ally_ansari

Thanks for the reply. With the configuration you suggested I get a 'label is missing' errror.

What I'd like to do is create correlations - and then isolate the variables that are highly correlated.

I'm following this youtube video and attempting to re-create this process flow

https://www.youtube.com/watch?v=zoycFvkB3SU

Screen Shot 2017-12-19 at 10.05.52 AM.png

ally_ansari

Ooops -

earmijo

That means you haven't defined roles for the different variables. Which is the varaible you are trying to predict? That is the label. Stick a Set Role operator between the ReadCSV and the Correlation Matrix.

Pavithra_Rao

Hi Ally,

Would you mind sharing the dataset you are trying to analyze? The issue may be specific to the dataset.

Attached is the similar process that I have built with a sample dataset for your reference. Also here is the instruction on How to Import a repository in RapidMiner

Cheers

Select by weights.zip

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