

   WWeeiigghhtt LLoossss DDaattaa ffrroomm aann OObbeessee PPaattiieenntt

   AArrgguummeennttss::

       Days: Time in days since the start of the programme.

     Weight: Weight in kilograms of the patient.

   SSUUMMMMAARRYY::

        The data frame gives the weight, in kilograms, of an
        obese patient at 52 time points over an 8 month period
        of a weight rehabilitation programme.

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        This data frame contains the following columns:

   SSOOUURRCCEE::

        Dr T. Davies, Adelaide.

   EExxaammpplleess::

        ### Not usable in R
        wtloss.fm <- nls(Weight ~ b0 + b1*2^(-Days/th),
            data = wtloss, start = list(b0=90, b1=95, th=120),
            trace = T)

