HR {survey}  R Documentation 
The HorvitzThompson estimator and the HartleyRao approximation require information in addition to the sampling probabilities for sampled individuals. These functions allow this information to be supplied.
HR(psum=NULL, strata = NULL) ppsmat(jointprob, tolerance = 1e04)
psum 
The sum of squared sampling probabilities for the population, divided by the sample size, as a single number or as a vector for stratified sampling 
strata 
Stratum labels, of the same length as psum , if psum is a vector

jointprob 
Matrix of pairwise sampling probabilities for the sampled individuals 
tolerance 
Tolerance for deciding that the covariance of sampling indicators is zero 
An object of class HR
or ppsmat
, suitable for supplying as the pps
argument to svydesign
.
election for examples of PPS designs
HR(0.1)