About: http://webisa.webdatacommons.org/9767739

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	You can even specify multiple factors as the grouping variable, for example treatment and sex, or team and handedness.
http://www.w3.org/ns/prov#wasQuotedFrom	r-bloggers.com