title: python global fitting for data-sets of different sizes
body: <p>I was wondering if there is a way I can use LMfit to fit datasets that have different sizes with the same model with a some shared and some independent parameters.</p>
  
  <p>This <a href="https://stackoverflow.com/questions/20339234/python-and-lmfit-how-to-fit-multiple-datasets-with-shared-parameters">link</a> is the closest I found to a similar question but it assumes the same x for all y.  </p>
  
  <p>Thanks for all advice and input</p>