title: How do you change the cutoff parameter in R's randomForest?
body: <p>The documentation says cutoff is "A vector of length equal to number of classes. The `winning' class for an observation is the one with the maximum ratio of proportion of votes to cutoff. Default is 1/k where k is the number of classes (i.e., majority vote wins)."</p>
  
  <p>I want to implement a cutoff of probabilities of 0.6 or 0.7 not the default of 0.5.</p>
  
  <pre><code>RFfit &lt;- randomForest(Y ~ x1 + x2 + x3 + x4 + x5, data=mydata, mytry=2, ntrees=500,
    cutoff = x)
  </code></pre>
  
  <p>I have tried various values for x. 0.6, 6, 12, 1.2... none seem to work. 
  I have also added a column called "cutoff" to my data where all values are = 0.6, and tried calling that into the code, but that did not work either. </p>
  
  <p>How do I use the cutoff argument properly?  </p>