rescaled.bootstrap.sample.pureR {surveybootstrap}

rescaled.bootstrap.sample.pureR

Description

(this is the pure R version; it has been supplanted by rescaled.bootstrap.sample, which is partially written in C++)

Usage

rescaled.bootstrap.sample.pureR(
  survey.data,
  survey.design,
  parallel = FALSE,
  paropts = NULL,
  num.reps = 1
)

Arguments

survey.data

the dataset to use

survey.design

a formula describing the design of the survey (see below - TODO)

parallel

if TRUE, use parallelization (via plyr)

paropts

an optional list of arguments passed on to plyr to control details of parallelization

num.reps

the number of bootstrap replication samples to draw

Details

given a survey dataset and a description of the survey design (ie, which combination of vars determines primary sampling units, and which combination of vars determines strata), take a bunch of bootstrap samples for the rescaled bootstrap estimator (see, eg, Rust and Rao 1996).

Note that we assume that the formula uniquely specifies PSUs. This will always be true if the PSUs were selected without replacement. If they were selected with replacement, then it will be necessary to make each realization of a given PSU in the sample a unique id. Bottom line: the code below assumes that all observations within each PSU (as identified by the design formula) are from the same draw of the PSU.

The rescaled bootstrap technique works by adjusting the estimation weights based on the number of times each row is included in the resamples. If a row is never selected, it is still included in the returned results, but its weight will be set to 0. It is therefore important to use estimators that make use of the estimation weights on the resampled datasets.

We always take m_i = n_i - 1, according to the advice presented in Rao and Wu (1988) and Rust and Rao (1996).

survey.design is a formula of the form
weight ~ psu_vars + strata(strata_vars), where weight is the variable with the survey weights and psu is the variable denoting the primary sampling unit

Value

a list with num.reps entries. each entry is a dataset which has at least the variables index (the row index of the original dataset that was resampled) and weight.scale (the factor by which to multiply the sampling weights in the original dataset).