graphics function

Regression model plots

graphics Plots from regression models fitted in ANOVA.

graphics(
  a,
  degree = 1,
  mod = TRUE,
  main = " ",
  sub = " ",
  xlab = "Levels (X)",
  ylab = "Response var (Y)",
  pch = 19,
  xlim = NULL,
  ylim = NULL,
  bty = "o"
)

Arguments

• a: Output from anova (performed in ExpDes).
• degree: For polynomial models, 1 (linear model) is the default, 2 (quadratic model), 3 (cubic model), "pot" (Power model), "log" (Logistic model), "gom" (Gompertz model) and "exp" (Exponential model).
• mod: Logic. Print the model expression and its R2 on the top of the graphic. The default is TRUE.
• main: Title of the plot. Empty is the default.
• sub: Subtitle of the plot. Empty is the default.
• xlab: Name for axis X.
• ylab: Name for axis Y.
• pch: Caracter type to be used on the observed values.
• xlim: Limits for axis X.
• ylim: Limits for axis Y.
• bty: Type of box the plot is fitted in.

Examples

data(ex1)
attach(ex1)
a<-crd(trat, ig, quali=FALSE, nl=FALSE)
graphics(a, degree=1)
graphics(a, degree=2)
graphics(a, degree=3)

References

STEEL, R. G. D.; TORRIE, J. H. Principles and procedures in Statistics: a biometrical approach. McGraw-Hill, New York, NY. 1980.

See Also

reg.poly, plotres.

Author(s)

Eric B Ferreira, eric.ferreira@unifal-mg.edu.br