The relative frequency citation (RFC) is used to determine the relative frequency of reference or mention from the study participants who served as informants and calculated using the formula:
where FC is the number of informants who cited or mentioned plant, and N is the total number of informants [23]. The values that are closest to 1 show that nearly all of the informants mentioned a specific medicinal plant that was used to treat a particular illness while low scores show that the usage or purpose of a medicinal plant species is mentioned by few, or occasionally by one, informant.
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