About: http://webisa.webdatacommons.org/72682749

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 final data set contains market information on each security for each half hour of the sample period, including volume, last price, and mean bid-ask spread.
http://www.w3.org/ns/prov#wasQuotedFrom	questia.com