| CrossStrata | R Documentation | 
Create new factor variable by crossing levels in several variables
CrossStrata(by, sep = "-", returnb = FALSE, asNumeric = FALSE, byExtra = NULL)
| by | Dataframe or matrix with several variables | 
| sep | Used to create new level names | 
| returnb | When TRUE an overview of original variabels according to new levels are also retuned. | 
| asNumeric | When TRUE the new variable is numeric. | 
| byExtra | Contains the same variables as by and represents another data set. | 
| a | The new variable | 
| aExtra | New variable according to byExtra | 
| b | Overview of original variabels according to new levels | 
CrossStrata(cbind(factor(rep(1:3,2)),c('A',rep('B',5)) ))
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