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Nces, there are only three levels to the scale, but probabilityNces, there are only three levels to the scale, but probability mass is assigned to values that can never occur (i.e. values less than 0 or greater than 2). For thesePLOS ONE | DOI:10.1371/journal.pone.0133939 July 28,9 /Metaphorical Reasoningreasons (i.e. consistency with previous work and statistical appropriateness), we will a