R packages - Oct 2018 - Announcement: SamplingStrata 1.3 on the CRAN

I am pleased to announce that a new release (1.3)  of SamplingStrata is now
available on CRAN.
This version offers a numer of important new features:

  o The optimization of the stratification of the population frame is run
in parallel if different   domains are considered. If not specified, n-1 of
total  available cores are used OR if number     of domains < (n-1) cores,
then a number of cores equal to number of domains are used.

  o A new function 'KmeansSolution' produces an initial solution using
the
kmeans algorithm by clustering atomic strata considering the values of
 the means of target variables in them.By indicating this solution as a
suggestion to the optimization step, this may greatly speed the convergence
to the optimal  solution.

  o A new function 'selectSampleSystematic' has been added. It allows to
select a stratified sample with the systematic method.

  o It is now possible to handle "anticipated variance" by introducing
a
model linking a proxy variable whose values are available for all units in
the sampling frame, with the target variable whose values are not
available. In this implementation only linear model can be chosen.

The package can be downloaded and installed from CRAN via:
install.packages("SamplingStrata")
or from github:
devtools::install_github("barcaroli/SamplingStrata")

Report any issue at:
https://github.com/barcaroli/SamplingStrata/issues

You can also find additional information at:
https://barcaroli.github.io/SamplingStrata/index.html

-- 
Giulio Barcaroli

Methods, Quality and Metadata Division - Methodologies Directorate

Italian National Institute of Statistics

	[[alternative HTML version deleted]]