nelder_decision: Create a Nelder Fan experimental design decision table

In kevinwolz/sysdesign: An R Toolbox for Creating & Analyzing Systematic Experimental Designs in Biology

Description

Creates a Nelder Fan experimental design decision table.

Usage

nelder_decision(
  DN,
  D1,
  N,
  tau = 1,
  even = FALSE,
  max.angle = 360,
  arc.borders = 1,
  spoke.borders = 1
)

Arguments

DN	Plant density within the last experimental arc (plants ha-1) (i.e. lower extreme of experimental plant density range).
D1	Plant density within the first experimental arc (plants ha-1) (i.e. upper extreme of experimental plant density range).
N	Number of experimental arcs (i.e. number of densities to be tested within D1 to DN).
tau	The "rectangularity" proportion. See nelder for details.
even	Logical indicated whether or not the design should be adjusted so that the angle between spokes goes evenly into max.angle (i.e. so that there are no spokes that must be removed from the experiment as border spokes).
max.angle	The maximum rotation (in degrees) of the design. If 360, then a full circle design will be created.
arc.borders	Number of border arcs on either extreme.
spoke.borders	Number of border spokes on either extreme (only used if max.angle < 360).

Details

This function helps explore Nelder Fan design options and select a design that meets external constraints (e.g. plant or space availability). Function inputs are identical to nelder, but inputs of any length are allowed. All possible combinations of inputs are created using expand.grid, and then each of these cases is passed to nelder for evaluation. Inputs and outputs are all combined and returned for evaluation.

Value

A tibble containing a wide range of traits of the experimental designs.

Author(s)

Kevin J Wolz, [e-mail]

See Also

Other definition functions: goelz_add_border(), goelz_corners(), goelz_guides(), goelz_mirror(), goelz_optim(), goelz_starts(), goelz(), nelder_biculture_competition(), nelder_biculture_optim(), nelder_biculture(), nelder_interspoke_distance(), nelder(), select_optimal_goelz(), select_optimal_nelder_biculture()

Examples

dat <- nelder_decision(DN         = seq(1000, 2000, 50),
                       D1         = 3000,
                       N          = 5,
                       tau        = 1,
                       even       = TRUE,
                       max.angle  = c(90, 180, 360))

kevinwolz/sysdesign documentation built on June 13, 2020, 1:35 a.m.