crd function

One factor Completely Randomized Design

crd Analyses balanced experiments in Completely Randomized Design under one single factor, considering a fixed model.

crd(
  treat,
  resp,
  quali = TRUE,
  mcomp = "tukey",
  nl = FALSE,
  hvar = "bartlett",
  sigT = 0.05,
  sigF = 0.05,
  unfold = NULL
)

Arguments

• treat: Numeric or complex vector containing the treatments.
• resp: Numeric or complex vector containing the response variable.
• quali: Logic. If TRUE (default), the treatments are assumed qualitative, if FALSE, quantitatives.
• mcomp: Allows choosing the multiple comparison test; the default is the test of Tukey, however, the options are: the LSD test ('lsd'), the LSD test with Bonferroni protection ('lsdb'), the test of Duncan ('duncan'), the test of Student-Newman-Keuls ('snk'), the test of Scott-Knot ('sk'), the Calinski and Corsten test ('ccF') and bootstrap multiple comparison's test ('ccboot').
• nl: Logic. If FALSE (default) linear regression models are adjusted. IF TRUE, non-linear regression models are adjusted.
• hvar: Allows choosing the test for homogeneity of variances; the default is the test of Bartlett, however there are other options: test of Levene ('levene'), test of Samiuddin ('samiuddin'), test of ONeill and Mathews ('oneillmathews') and the Layard test ('layard').
• sigT: The signficance to be used for the multiple comparison test; the default is 5%.
• sigF: The signficance to be used for the F test of ANOVA; the default is 5%.
• unfold: Says what must be done after the ANOVA. If NULL (default), recommended tests are performed; if '0', just ANOVA is performed; if '1', the simple effects are tested.

Returns

The output contains the ANOVA of the CRD, the Shapiro-Wilk normality test for the residuals of the model, the fitted regression models (when the treatments are quantitative) and/or the multiple comparison tests (when the treatments are qualitative).

Details

The arguments sigT and mcomp will be used only when the treatment are qualitative.

Examples

data(ex1)
attach(ex1)
crd(trat, ig, quali = FALSE, sigF = 0.05, unfold=NULL)

References

BANZATTO, D. A.; KRONKA, S. N. Experimentacao Agricola. 4 ed. Jaboticabal: Funep. 2006. 237 p.

FERREIRA, E. B.; CAVALCANTI, P. P. Funcao em codigo R para analisar experimentos em DIC simples, em uma so rodada. In: REUNIAO ANUAL DA REGIAO BRASILEIRA DA SOCIEDADE INTERNACIONAL DE BIOMETRIA, 54./SIMPOSIO DE ESTATISTICA APLICADA A EXPERIMENTACAO AGRONOMICA, 13., 2009, Sao Carlos. Programas e resumos... Sao Carlos, SP: UFSCar, 2009. p. 1-5.

See Also

fat2.crd, fat3.crd, split2.crd, fat2.ad.crd and fat3.ad.crd.

Author(s)

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

Denismar Alves Nogueira

Portya Piscitelli Cavalcanti