Changelog • sondage

Initial CRAN release.

Sampling methods

srs() - Simple random sampling with or without replacement
systematic() - Systematic sampling with random start
bernoulli() - Bernoulli sampling (random sample size)
up_brewer() - Brewer’s method for unequal probability sampling
up_maxent() - Maximum entropy / Conditional Poisson sampling
up_systematic() - Systematic sampling with unequal probabilities
up_poisson() - Poisson sampling (random sample size)
up_multinomial() - Unequal probability sampling with replacement
up_chromy() - Chromy’s sequential PPS with minimum replacement

Joint inclusion probabilities

up_maxent_jip() - Exact CPS joint probabilities (Aires’ formula)
up_brewer_jip() - Brewer & Donadio approximation
up_systematic_jip() - Exact systematic joint probabilities
up_poisson_jip() - Independent selections

Utilities

inclusion_prob() - Compute inclusion probabilities from measure of size

Features

All functions return indices for direct use with df[idx, ]
Batch sampling via nrep argument for simulations (maxent/cps)
C implementations for performance-critical algorithms