title: Predict cannot display the standard errors of the predictions, with se.fit=TRUE
body: <p>As said in the help(predict.nls), when se.fit=TRUE,the standard errors of the predictions should be calculated. However, my codes in the following do not display that, but only the predictions.</p>
  
  <pre><code>alloy &lt;- data.frame(x=c(10,30,51,101,203,405,608,810,1013,2026,4052,6078,
                          8104,10130),
                      y=c(0.3561333,0.3453,0.3355,0.327453,0.3065299,0.2839316,
                          0.2675214,0.2552821,0.2455726,0.2264957,0.2049573,
                          0.1886496,0.1755897,0.1651624))
  model &lt;- nls(y ~ a * x^(-b), data=alloy, start=list(a=.5, b=.1))
  predict(model, se=TRUE)
  </code></pre>
  
  <p>What's wrong with my codes? Thank you!</p>