RFREQReceive Frequency
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Relative importance value (RIV) for each species was determined by dividing the sum of the RDEN plus RBA plus RFREQ by three.
From these measures relative frequency (RFREQ, the percent frequency of one species per ha compared to all species), relative basal area (RBA, the percent basal area for one species compared to the total basal area for all species), and relative density (RDEN, the percent density of one species compared to all species per ha) were calculated and used to determine importance values (IV, the sum of RDEN, RBA and RFREQ) and relative importance values (RIV, the average of RDEN, RBA, and RFREQ expressed as a percent) for all tree species recorded (Cottam and Curtis 1956).