Construct a matrix of binary variables for calibration of sample weights according to known marginal population totals. The following methods are implemented:
calibVars.default(x)
calibVars.matrix(x)
calibVars.matrix(x)
calibVars.data.frame(x)
1  calibVars(x)

x 
a vector that can be interpreted as factor, or a matrix or

A matrix of binary variables that indicate membership to the corresponding factor levels.
Bernhard Meindl and Andreas Alfons
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