design.anova: Define an ANOVA Design

In powerbydesign: Power Estimates for ANOVA Designs

Description

Constructs an "design.anova" object required by the boot.power.anova function.

Usage

design.anova(
  between = list(),
  within = list(),
  default_within_correlation = 0,
  save_input_as = NULL,
  silent_load = FALSE
)

Arguments

between	list, between-subjects factors including its levels
within	list, within-subjects factors including its levels
default_within_correlation	numeric, default within-subjects correlation the correlation matrix is populated with (for designs including within-subjects factors)
save_input_as	character, file name prefix of the files the input values entered by the user are save to. File names are constructed as paste0(save_input_as,"_cor_matrix.csv") and paste0(save_input_as,"_means_and_sds.csv")
silent_load	boolean, FALSE (default): always show input dialogs (even if data was successfully loaded from a file); TRUE: show input dialogs only if file did not yet exist and break with error if data from file does not match the design

Details

Based on the supplied within-subjects factors and between-subjects factors, this function constructs all conditions of the ANOVA design and opens two dialog windows querying for the expected correlation matrix and cell means (+ standard deviations) for all conditions.

The first dialog window queries for the correlation matrix of the conditions. If you have a pure between-subjects design, you may instantly close this window. Otherwise, enter the expected correlations between all conditions that include within-subjects manipulations. Using the "default_within_correlation" parameter, a default value can be set. You should fill in only the lower triangle of the correlation matrix and only the values not containing NAs.

The second dialog window queries for the means and standard deviations expected for each condition.

Use the "save_input_as" parameter in order to define a file name prefix of the files where the function saves your input values. This will populate the dialog windows with the saved values on the next execution of this function. If the parameter is NULL, input values will not be saved. NOTE: You must delete the respective files if you want to change the design.

Value

object of type design.anova

See Also

boot.power.anova

Examples

## Not run: 
design <- design.anova(
   between = list(age = c("young","old"),
                  sex = c("male","female")),
   within = list(condition = c("cond1","cond2","cond3")),
   default_within_correlation = 0.7,
   save_input_as = "myexp1",
   silent_load = T
)

## End(Not run)

powerbydesign documentation built on Feb. 25, 2021, 5:10 p.m.