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How to generate a Scree Plot

febpriv_01febpriv_01 Member Posts: 1 Newbie
Currently writing a paper, would like to generate a SCREE PLOT to identify the dimensions to choose in a PCA analysis

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    hbajpaihbajpai Member Posts: 102 Unicorn
    Hey @febpriv_01,

    Scree plot is used to capture %variation explained for every PC. You can use PCA to Example set operator and plot proportion of variance to achieve it.



    Also, the XML code of mock process.
    <?xml version="1.0" encoding="UTF-8"?><process version="9.6.000">
      <context>
        <input/>
        <output/>
        <macros/>
      </context>
      <operator activated="true" class="process" compatibility="9.6.000" expanded="true" name="Process">
        <parameter key="logverbosity" value="init"/>
        <parameter key="random_seed" value="2001"/>
        <parameter key="send_mail" value="never"/>
        <parameter key="notification_email" value=""/>
        <parameter key="process_duration_for_mail" value="30"/>
        <parameter key="encoding" value="SYSTEM"/>
        <process expanded="true">
          <operator activated="true" class="retrieve" compatibility="9.6.000" expanded="true" height="68" name="Retrieve Sonar" width="90" x="45" y="34">
            <parameter key="repository_entry" value="//Samples/data/Sonar"/>
          </operator>
          <operator activated="true" class="principal_component_analysis" compatibility="9.6.000" expanded="true" height="103" name="PCA" width="90" x="246" y="85">
            <parameter key="dimensionality_reduction" value="keep variance"/>
            <parameter key="variance_threshold" value="0.95"/>
            <parameter key="number_of_components" value="1"/>
          </operator>
          <operator activated="true" class="converters:pca_2_example_set" compatibility="0.6.000" expanded="true" height="82" name="PCA Result to ExampleSet" width="90" x="380" y="187"/>
          <connect from_op="Retrieve Sonar" from_port="output" to_op="PCA" to_port="example set input"/>
          <connect from_op="PCA" from_port="example set output" to_port="result 1"/>
          <connect from_op="PCA" from_port="preprocessing model" to_op="PCA Result to ExampleSet" to_port="pca"/>
          <connect from_op="PCA Result to ExampleSet" from_port="exa" 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>
    

    Best,
    Harshit
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