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Table 2 Frequency of four possible combinations for two binary variables

From: Small regions as key sources of traditional knowledge: a quantitative ethnobotanical survey in the central Balkans

 

x = presence

y = absence

Sum

x = presence

A

B

a + b

y = absence

C

D

c + d

Sum

a + c

b + d

a + b + c + d

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Journal of Ethnobiology and Ethnomedicine

ISSN: 1746-4269

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