
Measuring Diversity of Environmental SystemsMeasuring Diversity of Environmental Systems 39
However the assumption of minimum diversity equal to 0 should be
more correct since, as already mentioned, at the beginning of a study we
should assume that all the events of (O) would be equivalent, i.e., would
belong to the same set. In other words at the beginning of a study we do
not know how the quantity Q could be partitioned in S classes because
S is unknown and it is unkonwn also the similarity-dissimilarity between
the S possible classes.
A graphical way to express the evenness for crispy diversity is the well
known curve of Lorenz (Lorenz 1905, ...