About: http://webisa.webdatacommons.org/428780379

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	For statistical accuracy, the observations must be taken at random times during the period of study, and the period must be representative of the types of activities performed by the subjects.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org