They specify VRP generally as the difference between the variance indicated by past values of variance (realized) and that indicated by current option prices (implied). (cxoadvisory.com)
Psychoanalysis has shown that we preserve more past values than we are conscious of, but this is still a matter of degree. (religion-online.org)
Movements by these birds and fish once carried more than 300 million pounds of phosphorus onto land each year, but that number has declined to less than four percent of past values as a result of destroyed seabird colonies, habitat loss, and overfishing. (sciencedaily.com)