wtloss {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

    data(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

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

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