ANOVA_design: Design function used to specify the parameters to be used in...

In Superpower: Simulation-Based Power Analysis for Factorial Designs

Design function used to specify the parameters to be used in simulations

Description

Design function used to specify the parameters to be used in simulations

Usage

ANOVA_design(
  design,
  n,
  mu,
  sd,
  r = 0,
  label_list = NULL,
  labelnames = NULL,
  plot = Superpower_options("plot")
)

Arguments

design	String specifying the ANOVA design.
n	Sample size in each condition
mu	Vector specifying mean for each condition
sd	standard deviation for all conditions (or a vector specifying the sd for each condition)
r	Correlation between dependent variables (single value or matrix)
label_list	An optional list to specify the factor names and condition (recommended, if not used factors and levels are indicated by letters and numbers).
labelnames	Optional vector to specifying factor and condition names. This parameter is deprecated and will be overridden by input from label_list.
plot	Should means plot be printed (defaults to TRUE)

Value

Returns single list with simulated data, design, design list, factor names, formulas for ANOVA, means, sd, correlation, sample size per condition, correlation matrix, covariance matrix, design string, labelnames, labelnameslist, factor names, meansplot

"dataframe"

A sample dataframe of what data could look like given the proposed parameters.

"design"

aov The design string, e.g. "2b*2w".

"design_list"

The list of variables in the design.

"frml1"

The first formula created for this design.

"frml2"

The second formula created for this design.

"mu"

Vector of means.

"sd"

Vector of standard deviations.

"r"

Common correlation coefficient.

"n"

Sample size per cell. Can be entered as a single value or list of sample sizes for each condition. If unequal n is entered then the design can only be passed onto ANOVA_power.

"cor_mat"

The correlation matrix.

"sigmatrix"

The variance-covariance matrix.

"design_factors"

Total number of within-subjects factors.

"labelnames"

List of the label names.

"labelnameslist"

Secondary list of labelnames

"factornames"

List of the factor titles.

"meansplot"

Plot of the experimental design.

Warnings

Varying the sd or r (e.g., entering multiple values) violates assumptions of homoscedascity and sphericity respectively

Examples

## Set up a within design with 2 factors, each with 2 levels,
## with correlation between observations of 0.8,
## 40 participants (who do all conditions), and standard deviation of 2
## with a mean pattern of 1, 0, 1, 0, conditions labeled 'condition' and
## 'voice', with names for levels of "cheerful", "sad", and "human", "robot"
ANOVA_design(design = "2w*2w", n = 40, mu = c(1, 0, 1, 0), sd = 2, r = 0.8,
      label_list= list(condition = c("cheerful", "sad"), 
      voice = c("human", "robot")))

Superpower documentation built on May 17, 2022, 5:08 p.m.