title: Nonlinear multiple regression in R
body: <p>I'm trying to run a nonlinear multiple regression in R with a dataset, it has thousands of rows so I'll just put the first few here:</p>
  <pre><code>      Header.1 Header.2   Header.3  Header.4 Header.5 Header.6 Header.7
  1          -60      -45 615 720        1.8318          0.428    -11.614
  2          -59      -45 616 720        1.8322          0.429    -11.498
  3          -58      -45 617 720        1.8326          0.430    -11.383
  4          -57      -45 618 720        1.8330          0.430    -11.267
  5          -56      -45 619 720        1.8334          0.431    -11.152
  6          -55      -45 620 720        1.8338          0.432    -11.036
  7          -54      -45 621 720        1.8342          0.433    -10.921
  8          -53      -45 622 720        1.8346          0.433    -10.806
  9          -52      -45 623 720        1.8350          0.434    -10.691
  10         -51      -45 624 720        1.8354          0.435    -10.576
  11         -50      -45 625 720        1.8357          0.435    -10.461
  12         -49      -45 626 720        1.8361          0.436    -10.347
  13         -48      -45 627 720        1.8365          0.437    -10.232
  14         -47      -45 628 720        1.8369          0.438    -10.118
  15         -46      -45 629 720        1.8373          0.438    -10.003
  16         -45      -45 630 720        1.8377          0.439     -9.889
  17         -44      -45 631 720        1.8381          0.440     -9.775
  18         -43      -45 632 720        1.8385          0.440     -9.660
  19         -42      -45 633 720        1.8389          0.441     -9.546
  20         -41      -45 634 720        1.8393          0.442     -9.432
  21         -40      -45 635 720        1.8397          0.442     -9.318
  22         -39      -45 636 720        1.8400          0.443     -9.205
  23         -38      -45 637 720        1.8404          0.444     -9.091
  24         -37      -45 638 720        1.8408          0.445     -8.977
  25         -36      -45 639 720        1.8412          0.445     -8.864
  26         -35      -45 640 720        1.8416          0.446     -8.751
  27         -34      -45 641 720        1.8420          0.447     -8.637
  28         -33      -45 642 720        1.8424          0.447     -8.524
  </code></pre>
  <p>Can someone please explain to me in very simple terms how to run a <em>nonliner</em> multiple regression using Header.1 and Header.2 as independent variables and Header.7 as the dependent variable? I successfully ran a linear multiple regression using <code>lm()</code>, but when I tried to use <code>nls()</code>, I got the following error message:</p>
  <blockquote>
  <p>Error in getInitial.default(func, data, mCall = as.list(match.call(func,  :
  no 'getInitial' method found for &quot;function&quot; objects</p>
  </blockquote>
  <p>If you need more information in order to be able to run the regression let me know. Thanks.</p>