Leaf Weight Over Time for Two Varieties of Soybean

SUMMARY:

As described by Davidian and Giltinan, "Data from an experiment to compare growth patterns of two genotypes of soybeans: Plant Introduction #416937 (P), and experimental strain, and Forrest (F), a commercial variety." A more complete description is given on page 7 of Davidian and Giltinan (1995).

DATA DESCRIPTION:

This data frame contains the following columns:

ARGUMENTS:

Plot
a factor giving a unique identifier for each plot.
Variety
a factor indicating variety F or variety P.
Year
the year the plot was planted.
time
time the sample was taken (days after planting).
weight
average leaf weight per plant (g).

SOURCE:

These data are described in section 1.1.3 of Davidian and Giltinan (1995), "Nonlinear Models for Repeated Measurement Data", Chapman and Hall, London.

SEE ALSO:

, , , .

EXAMPLES:

Soybean.lis <- nlsList(weight ~ logistic(time, Asym, T50, scal), 
                       data = Soybean, cluster = ~ Plot) 
Soybean.nlme <- nlme(Soybean.lis)