About: http://webisa.webdatacommons.org/29980004

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	I assume the correct steps would be to first define the number of groups, then run a model including covariates.
http://www.w3.org/ns/prov#wasQuotedFrom	statmodel.com