Clean strata
Renumbers a variable of stratification (categorical variable). The strata receive a number from 1 to the last stratum number. The empty strata are suppressed. This function is used in ‘balancedstratification’.
cleanstrata(strata)
strata |
vector of stratum numbers. |
# definition of the stratification variable strata=c(-2,3,-2,3,4,4,4,-2,-2,3,4,0,0,0) # renumber the strata cleanstrata(strata)
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