Create a design with multiple experimental arms

Creates a design with m_arms experimental arms, each assigned with equal probability.

multi_arm_designer(
  N = 30,
  m_arms = 3,
  outcome_means = rep(0, m_arms),
  sd_i = 1,
  outcome_sds = rep(0, m_arms),
  conditions = 1:m_arms,
  args_to_fix = NULL
)

Arguments

N	An integer. Sample size.
m_arms	An integer. Number of arms.
outcome_means	A numeric vector of length m_arms. Average outcome in each arm.
sd_i	A nonnegative scalar. Standard deviation of individual-level shock (common across arms).
outcome_sds	A nonnegative numeric vector of length m_arms. Standard deviations for condition-level shocks.
conditions	A vector of length m_arms. The names of each arm. It can be given as numeric or character class (without blank spaces).
args_to_fix	A character vector. Names of arguments to be args_to_fix in design. By default, m_arms and conditions are always args_to_fix.

Value

A function that returns a design.

Details

See vignette online.

Author

DeclareDesign Team

Examples

# To make a design using default arguments:
design <- multi_arm_designer()


# A design with different means and standard deviations in each arm
design <- multi_arm_designer(outcome_means = c(0, 0.5, 2), outcome_sds =  c(1, 0.1, 0.5))

design <- multi_arm_designer(N = 80, m_arms = 4, outcome_means = 1:4,
                             args_to_fix = c("outcome_means", "outcome_sds"))