About: http://webisa.webdatacommons.org/43072064

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	It is tough to control for ???modernization??? in modeling these relationships, and researchers often use time lags, weights, or other tricks to try to fit a trend line to data.
http://www.w3.org/ns/prov#wasQuotedFrom	freedom-to-tinker.com