probabilities of assignment: Simple Random Assignment
probabilities of assignment: Simple Random Assignment
simple_ra_probabilities(N, prob = NULL, prob_unit = NULL, prob_each = NULL, num_arms = NULL, conditions = NULL, check_inputs = TRUE, simple = TRUE)
N |
The number of units. N must be a positive integer. (required) |
prob |
Use for a two-arm design. prob is the probability of assignment to treatment and must be a real number between 0 and 1 inclusive and must be length 1. (optional) |
prob_unit |
Use for a two-arm design. prob is the probability of assignment to treatment and must be a real number between 0 and 1 inclusive and must be length N. (optional) |
prob_each |
Use for a multi-arm design in which the values of prob_each determine the probabilities of assignment to each treatment condition. prob_each must be a numeric vector giving the probability of assignment to each condition. All entries must be nonnegative real numbers between 0 and 1 inclusive and the total must sum to 1. It may be a conditions-length vector or a N-by-conditions matrix. (optional) |
num_arms |
The number of treatment arms. If unspecified, num_arms will be determined from the other arguments. (optional) |
conditions |
A character vector giving the names of the treatment groups. If unspecified, the treatment groups will be named 0 (for control) and 1 (for treatment) in a two-arm trial and T1, T2, T3, in a multi-arm trial. An exception is a two-group design in which num_arms is set to 2, in which case the condition names are T1 and T2, as in a multi-arm trial with two arms. (optional) |
check_inputs |
logical. Defaults to TRUE. |
simple |
logical. internal use only. |
A matrix of probabilities of assignment
# Two Group Designs
prob_mat <- simple_ra_probabilities(N=100)
head(prob_mat)
prob_mat <- simple_ra_probabilities(N=100, prob=0.5)
head(prob_mat)
prob_mat <- simple_ra_probabilities(N=100, prob_each = c(0.3, 0.7),
conditions = c("control", "treatment"))
head(prob_mat)
# Multi-arm Designs
prob_mat <- simple_ra_probabilities(N=100, num_arms=3)
head(prob_mat)
prob_mat <- simple_ra_probabilities(N=100, prob_each=c(0.3, 0.3, 0.4))
head(prob_mat)
prob_mat <- simple_ra_probabilities(N=100, prob_each=c(0.3, 0.3, 0.4),
conditions=c("control", "placebo", "treatment"))
head(prob_mat)
prob_mat <- simple_ra_probabilities(N=100, conditions=c("control", "placebo", "treatment"))
head(prob_mat)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.