About: http://webisa.webdatacommons.org/54825249

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	The results using instrumental variables often differed from those using ordinary least-squares, which may indicate that selection bias really is a problem.
http://www.w3.org/ns/prov#wasQuotedFrom	ed.gov