Richness
Richness simply quantifies how many different types the dataset of interest contains. For example, species richness (usually notated S) of a dataset is the number of different species in the corresponding species list. Richness is a simple measure, so it has been a popular diversity index in ecology, where abundance data are often not available for the datasets of interest. Because richness does not take the abundances of the types into account, it is not the same thing as diversity, which does take abundances into account. However, if true diversity is calculated with q = 0, the effective number of types (0D) equals the actual number of types (R).
Read more about this topic: Diversity Index
Famous quotes containing the word richness:
“Language fails not because thought fails, but because no verbal symbols can do justice to the fullness and richness of thought. If we are to continue talking about “data” in any other sense than as reflective distinctions, the original datum is always such a qualitative whole.”
—John Dewey (1859–1952)
“... the selfishness that is bred of great success is our shame. We have subdued the wilderness and made it ours. We have conquered the earth and the richness thereof. We have indelibly stamped upon its face the seal of our dominating will. Now, unlike Alexander sighing for more worlds to conquer, we should address ourselves to adding beauty to that glory and grandeur.”
—Alice Foote MacDougall (1867–1945)
“Down to the Puritan marrow of my bones
There’s something in this richness that I hate.
I love the look, austere, immaculate,
Of landscapes drawn in pearly monotones.”
—Elinor Wylie (1885–1928)