About: http://webisa.webdatacommons.org/256482818

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	Sample selection bias is a recurring problem for virtually all surveys in which participation is not mandatory, and it is possible to correct for it - but only if you know the true distribution of the underlying distribution.
http://www.w3.org/ns/prov#wasQuotedFrom	typepad.com