strata_and_cluster_rs {randomizr}

Stratified and Clustered Random Sampling

Description

A random sampling procedure in which units are sampled as clusters and clusters are nested within strata.

Usage

strata_and_cluster_rs(
  strata = NULL,
  clusters = NULL,
  prob = NULL,
  prob_unit = NULL,
  n = NULL,
  n_unit = NULL,
  strata_n = NULL,
  strata_prob = NULL,
  check_inputs = TRUE
)

Arguments

strata

A vector of length N that indicates which stratum each unit belongs to.

clusters

A vector of length N that indicates which cluster each unit belongs to.

prob

Use for a design in which either floor(N_clusters_stratum*prob) or ceiling(N_clusters_stratum*prob) clusters are sampled within each stratum. The probability of being sampled is exactly prob because with probability 1-prob, floor(N_clusters_stratum*prob) clusters will be sampled and with probability prob, ceiling(N_clusters_stratum*prob) clusters will be sampled. prob must be a real number between 0 and 1 inclusive. (optional)

prob_unit

Must of be of length N. tapply(prob_unit, blocks, unique) will be passed to strata_prob.

n

Use for a design in which the scalar n describes the fixed number of units to sample in each stratum. This number does not vary across strata.

n_unit

Must be of length N. tapply(m_unit, blocks, unique) will be passed to strata_n.

strata_n

Use for a design in which strata_n describes the number of units to sample within each stratum.

strata_prob

Use for a design in which strata_prob describes the probability of being sampled within each stratum. Differs from prob in that the probability of being sampled can vary across strata.

check_inputs

logical. Defaults to TRUE.

Value

A numeric vector of length N that indicates if a unit is sampled (1) or not (0).

Examples

clusters <- rep(letters, times = 1:26)

strata <- rep(NA, length(clusters))
strata[clusters %in% letters[1:5]] <- "stratum_1"
strata[clusters %in% letters[6:10]] <- "stratum_2"
strata[clusters %in% letters[11:15]] <- "stratum_3"
strata[clusters %in% letters[16:20]] <- "stratum_4"
strata[clusters %in% letters[21:26]] <- "stratum_5"

table(strata, clusters)

S <- strata_and_cluster_rs(strata = strata,
                          clusters = clusters)

table(S, strata)
table(S, clusters)


S <- strata_and_cluster_rs(clusters = clusters,
                           strata = strata,
                           prob = .5)

table(S, clusters)
table(S, strata)

S <- strata_and_cluster_rs(clusters = clusters,
                           strata = strata,
                           strata_n = c(2, 3, 2, 3, 2))

table(S, clusters)
table(S, strata)

S <- strata_and_cluster_rs(clusters = clusters,
                           strata = strata,
                           strata_prob = c(.1, .2, .3, .4, .5))

table(S, clusters)
table(S, strata)