wtloss                 package:MASS                 R Documentation

Weight Loss Data from an Obese Patient

Description:

     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.

Usage:

     wtloss

Format:

     This data frame contains the following columns:

     'Days' time in days since the start of the programme.

     'Weight' weight in kilograms of the patient.


Source:

     Dr T. Davies, Adelaide.

References:

     Venables, W. N. and Ripley, B. D. (2002) _Modern Applied
     Statistics with S._ Fourth edition.  Springer.

Examples:

     wtloss.fm <- nls(Weight ~ b0 + b1*2^(-Days/th),
         data = wtloss, start = list(b0=90, b1=95, th=120),
         trace = TRUE)

