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C50 Node Assignment

3 messages · David Winsemius, Carl Witthoft, Max Kuhn

David Winsemius
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Kevin Shaney <kevin.shaney at rosetta.com>

C50 Node Assignment

I am using C50 to classify individuals into 5 groups / categories (factor variable).  The tree / set of rules has 10 rules for classification.  I am trying to extract the RULE for which each individual qualifies (a number between 1 and 10), and cannot figure out how to do so.  I can extract the predicted group and predicted group probability, but not the RULE to which an individual qualifies.  Please let me know if you can help!

Kevin
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Carl Witthoft
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Just to clarify:  I'm guessing the OP is referring to the CRAN package C50
here.   A quick skim suggests the rules are a list element of a C5.0-class
object, so maybe that's where to start?


David Winsemius wrote

            

      
      
      
    

        

      
      
    

        
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      Max Kuhn
    

    

      
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There is a sub-object called 'rules' that has the output of C5.0 for this model:

            

      
      
      
    

        
id="See5/C5.0 2.07 GPL Edition 2013-11-09"
entries="1"
rules="4" default="setosa"
conds="1" cover="50" ok="50" lift="2.94231" class="setosa"
type="2" att="Petal.Length" cut="1.9" result="<"
conds="3" cover="48" ok="47" lift="2.88" class="versicolor"
type="2" att="Petal.Length" cut="1.9" result=">"
type="2" att="Petal.Length" cut="4.9000001" result="<"
type="2" att="Petal.Width" cut="1.7" result="<"
conds="1" cover="46" ok="45" lift="2.875" class="virginica"
type="2" att="Petal.Width" cut="1.7" result=">"
conds="1" cover="46" ok="44" lift="2.8125" class="virginica"
type="2" att="Petal.Length" cut="4.9000001" result=">"

You would either have to parse this or parse the summary results:

            

      
      
      
    

        
Call:
C5.0.formula(formula = Species ~ ., data = iris, rules = TRUE)

<snip>
Rules:

Rule 1: (50, lift 2.9)
Petal.Length <= 1.9
->  class setosa  [0.981]

Rule 2: (48/1, lift 2.9)
Petal.Length > 1.9
Petal.Length <= 4.9
Petal.Width <= 1.7
->  class versicolor  [0.960]
<snip>

Max

        
On Sat, Nov 9, 2013 at 1:11 PM, Carl Witthoft <carl at witthoft.com> wrote: