title: ANOVA error on R
body: <p>I get this error when I run an ANOVA on R:</p>
  
  <pre><code>Warning messages:
  1: In model.response(mf, "numeric") :
     using type = "numeric" with a factor response will be ignored
  2: In Ops.factor(y, z$residuals) : ‘-’ not meaningful for factors
  </code></pre>
  
  <p>I don't really understand what this means and haven't really found any explanation online for it. Here's what my ANOVA is:</p>
  
  <pre><code>fit &lt;- aov(PC1 ~ Type, data=dffinalSep)
  </code></pre>
  
  <p>And here's the str() for my data frame:</p>
  
  <pre><code>'data.frame':   44 obs. of  4 variables:
   $ Name: Factor w/ 22 levels "REVICF1","REVICF4",..: 1 2 3 4 5 6 7 8 9 10 ...
   $ Type: Factor w/ 2 levels "N","S": 1 1 1 1 1 1 1 1 1 1 ...
   $ PC1 : Factor w/ 44 levels "-11.230081419753",..: 31 44 36 35 27 2 17 16 32 38 ...
   $ PC2 : Factor w/ 44 levels "-110.874127803912",..: 1 12 25 29 8 13 42 43 22 26 ...
  </code></pre>
  
  <p>I'm not really sure what I'm doing wrong. The data frame contains two variables from a PCA using <code>prcomp</code> and then the Type variable which contains two different values (N and S). Any help would be appreciated.</p>
  
  <p>Thanks!</p>