C1 {nlreg}

Six Herbicide Data Sets

Description

The C1–C4, M2 and M4 data frames have 40 to 72 rows and three columns.

Six bioassay on the action of the herbicides chlorsulfuron and metsulfuron methyl on the callus area of colonies of Brassica napus L. The experiments consist of measurements for different dose levels and can be balanced (C4, M2) or unbalanced (C1, C2, C3, M4).

Usage

  data(C1)
  data(C2)
  data(C3)
  data(C4)
  data(M2)
  data(M4)

Format

These data frame contain the following columns:

group

indicator variable for each tested dose;

dose

the tested dose (nmol/l);

area

the callus area (mm^2).

Note

Data sets C3 and chlorsulfuron are the same. Data sets M2 and metsulfuron are the same.

Source

The data were obtained from

Seiden, P., Kappel, D. and Streibig, J. C. (1998) Response of Brassica napus L. tissue culture to metsulfuron methyl and chlorsulfuron. Weed Research, 38, 221–228.

References

Bellio, R., Jensen, J.E. and Seiden, P. (2000). Applications of likelihood asymptotics for nonlinear regression in herbicide bioassays. Biometrics, 56, 1204–1212.

Brazzale, A. R. (2000) Practical Small-Sample Parametric Inference. Ph.D. Thesis N. 2230, Department of Mathematics, Swiss Federal Institute of Technology Lausanne. Section 5.3, Example 8.

See Also

chlorsulfuron, metsulfuron

Examples

data(C3)
attach(C3)
plot(dose, area, xlab = "tested dose (nmol/l)", 
     ylab = "log callus area (mm^2)", log = "y")
detach()