Dear R users,
I would like to announce that on the CRAN is now available a new package
(SamplingStrata version 0.9) for the optimal stratification of sampling frames.
This package offers an approach for the determination of the best stratification
of a sampling frame, the one that ensures the minimum sample size under the
condition to satisfy precision constraints in a multivariate and multidomain
case. This approach is based on the use of the genetic algorithm: each solution
(i.e. a particular partition in strata of the sampling frame) is considered as
an individual in a population to be evolved; the fitness of all individuals is
evaluated by calculating (using the Bethel-Chromy algorithm) the sampling size
satisfying accuracy constraints on the target estimates.
The package covers all the phases, from the optimisation of the sampling frame,
up to the design of the stratified sample, ending with the selection of the
units.
In the tar.gz (directory: \inst\doc) it is possible to find a vignette
('SamplingStrataVignette.pdf') showing a complete application, from the
optimisation of the sampling frame to the selection of the required sample.
I would appreciate any feedback
Sincerely,
Giulio Barcaroli
--
Giulio Barcaroli
Methods, Tools and Methodological Support
Italian National Institute of Statistics
barcarol at istat.it
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