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Provides functions to create factor variables with contrasts based on weighted effect coding, and their interactions. In weighted effect coding the estimates from a first order regression model show the deviations per group from the sample mean. This is especially useful when a researcher has no directional hypotheses and uses a sample from a population in which the number of observation per group is different.
Package details 


Author  Rense Nieuwenhuis, Manfred te Grotenhuis, Ben Pelzer, Alexander Schmidt, Ruben Konig, Rob Eisinga 
Maintainer  Rense Nieuwenhuis <[email protected]> 
License  GPL3 
Version  0.41 
URL  http://www.ru.nl/sociology/mt/wec/downloads/ 
Package repository  View on CRAN 
Installation 
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