The Nolan Index: A Quantitative Measure of List Similarities

Several ethnobiological studies have used the Jaccard Index, a qualitative, binary measure, to compare group similarities and differences in lists of plant animal species, medicinals, foods, cultural utilities, so on. We extend this effort by formulating Nolan new, more precise quantitative measure relative frequency listed items between groups . It is deployed here evaluate degree similarity free-listed, wild plants novices experts rural Missouri.