title: Why is my nonlinear model fitting in mathematica not providing small figures?
body: <pre><code>#dataset, sigmoidal curve
  ratio278a267 ={{5.445, 0.0501}, {6.177, 0.035}, {7., 0.0589}, {7.368, 
    0.0953}, {7.73, 0.1419}, {8.169, 1.0697}, {9.141, 1.0869}, {10.3, 
    1.0981}} 
  
  #nonlinearmodelfitting for dataset
  fit = FindFit[ratio278a267, (1/(a + (E^(-b*(x - c))))), {a, b, c}, x]
  fit2 = NonlinearModelFit[
     ratio278a267, (1/(a + (E^(-b*(x - c))))), {a, b, c}, x]["RSquared"]
  
  #fit1 &amp; fit2 output respectively
  output:
  {a -&gt; 0.639719, b -&gt; -250.201, c -&gt; -1008.92}
  0.
  </code></pre>
  
  <p>The code above is what i used for a nonlinear fitting in Mathematica, and the output has not provided reasonably small figures, despite me having plotted this in a graphing calculator overlaid ontop of my dataset, with numbers between 0-10 for a,b,c and have obtained reasonable fitting</p>