split_plot {FielDHub}

Generates a Split Plot Design

Description

It randomly generates a split plot design (SPD) across locations.

Usage

split_plot(
  wp = NULL,
  sp = NULL,
  reps = NULL,
  type = 2,
  l = 1,
  plotNumber = 101,
  seed = NULL,
  locationNames = NULL,
  factorLabels = TRUE,
  data = NULL
)

Arguments

wp

Number of whole plots, as an integer or a vector.

sp

Number of sub plots per whole plot, as an integer or a vector.

reps

Number of blocks (full replicates).

type

Option for CRD or RCBD designs. Values are type = 1 (CRD) or type = 2 (RCBD). By default type = 2.

l

Number of locations. By default l = 1.

plotNumber

Numeric vector with the starting plot number for each location. By default plotNumber = 101.

seed

(optional) Real number that specifies the starting seed to obtain reproducible designs.

locationNames

(optional) Names for each location.

factorLabels

(optional) If TRUE retain the levels labels from the original data set otherwise, numeric labels will be assigned. Default is factorLabels =TRUE.

data

(optional) Data frame with label list of treatments.

Value

A list with two elements.

• infoDesign is a list with information on the design parameters.

• fieldBook is a data frame with the split plot field book.

Author(s)

Didier Murillo [aut], Salvador Gezan [aut], Ana Heilman [ctb], Thomas Walk [ctb], Johan Aparicio [ctb], Richard Horsley [ctb]

References

Federer, W. T. (1955). Experimental Design. Theory and Application. New York, USA. The Macmillan Company.

Examples

# Example 1: Generates a split plot design SPD with 4 whole plots, 2 sub plots per whole plot,
# and 4 reps in an RCBD arrangement. This in for a single location.
SPDExample1 <- split_plot(wp = 4, sp = 2, reps = 5, l = 1, 
                          plotNumber = 101, 
                          seed = 14,
                          type = 2, 
                          locationNames = "FARGO")
SPDExample1$infoDesign
SPDExample1$layoutlocations
head(SPDExample1$fieldBook,12)

# Example 2: Generates a split plot design SPD with 5 whole plots 
# (4 types of fungicide + one control), 10 sub plots per whole plot (10 bean varieties), 
# and 6 reps in an RCBD arrangement. This in 3 locations or sites.
# In this case, we show how to use the option data.
wp <- c("NFung", paste("Fung", 1:4, sep = ""))  # Fungicides (5 Whole plots)
sp <- paste("Beans", 1:10, sep = "")            # Beans varieties (10 sub plots)
split_plot_Data <- data.frame(list(WHOLPLOT = c(wp, rep(NA, 5)), SUBPLOT = sp))
head(split_plot_Data, 12)
SPDExample2 <- split_plot(reps = 6, l = 3, 
                          plotNumber = c(101, 1001, 2001),
                          seed = 23, 
                          type = 2, 
                          locationNames = c("A", "B", "C"),
                          data = split_plot_Data)
SPDExample2$infoDesign
SPDExample2$layoutlocations
head(SPDExample2$fieldBook,12)