The ecological quality ratio is the ratio beween a parameter value and its reference value:
EQR = (x-bad)/(ref-bad)
ref, the EQR usually
(but not necessarily!) varies between 0 (bad ecological quality) and 1 (
ecological quality equals the reference status).
eqr(x, bad, ref)
numeric vector containing benthic indices
the value for a bad status
the value for a reference status
numeric vector with EQR-values: low values indicate bad ecological quality and high values indicate good ecological quality.
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