draw_samples: Draw an SRS from a small population

In danjdrennan/surveyr: Summary Statistics and Visualizations for Surveys

Description

Draws samples from a simple population of data and returns (1) the sample index and (2) the sampled values from the population. Useful for generating draws from small, finite populations for pedagogical demonstrations or for generating sampling distributions.

Usage

draw_samples(y, n)

Arguments

y	Vector of population data to generate samples with. The vector can be anything, numeric or otherwise, but is primarily intended for working with numerical data. The length of y will be used as the population size, N.
n	Sample size to use when drawing samples.

Value

sample_indices A matrix with choose(N, n) rows and n columns. Each row corresponds to a sample of the indices in the population, y.

sampled_data A matrix with choose(N, n) rows and n columns. Each row is a sample drawn from y with sample size n.

Examples

# Example 1:
# ----------
set.seed(1)
y <- rnorm(10)
out <- draw_samples(y, 3)
out$sample_indices[1:3, ]
#     [,1] [,2] [,3]
#[1,]    1    2    3
#[2,]    1    2    4
#[3,]    1    2    5
out$sampled_data[1:3, ]
#           [,1]      [,2]       [,3]
#[1,] -0.6264538 0.1836433 -0.8356286
#[2,] -0.6264538 0.1836433  1.5952808
#[3,] -0.6264538 0.1836433  0.3295078

# Example 2:
# ----------
y <- c(1, 3, 3)
out <- draw_samples(y, 2)
out$sample_indices
#     [,1] [,2]
#[1,]    1    2
#[2,]    1    3
#[3,]    2    3
out$sampled_data
#     [,1] [,2]
#[1,]    1    3
#[2,]    1    3
#[3,]    1    3

danjdrennan/surveyr documentation built on Dec. 19, 2021, 8:08 p.m.