Soybean                 package:nlme                 R Documentation

Growth of soybean plants

Description:

     The 'Soybean' data frame has 412 rows and 5 columns.

Format:

     This data frame contains the following columns:

     Plot a factor giving a unique identifier for each plot.

     Variety a factor indicating the variety; Forrest (F) or Plant
          Introduction #416937 (P).

     Year a factor indicating the year the plot was planted.

     Time a numeric vector giving the time the sample was taken (days
          after planting).

     weight a numeric vector giving the average leaf weight per plant
          (g).

Details:

     These data are described in Davidian and Giltinan (1995, 1.1.3,
     p.7) as ``Data from an experiment to compare growth patterns of
     two genotypes of soybeans: Plant Introduction #416937 (P), an
     experimental strain, and Forrest (F), a commercial variety.''

Source:

     Pinheiro, J. C. and Bates, D. M. (2000), _Mixed-Effects Models in
     S and S-PLUS_, Springer, New York.  (Appendix A.27)

     Davidian, M. and Giltinan, D. M. (1995), _Nonlinear Models for
     Repeated Measurement Data_,  Chapman and Hall, London.

Examples:

     data(Soybean)
     summary(fm1 <- nlsList(SSlogis, data = Soybean))

