@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_method_	skos:broader	isac:estimation_method_ .
isac:_model_	skos:broader	isac:estimation_method_ .
isac:maximum_likelihood_	skos:broader	isac:estimation_method_ .
isac:least_square_	skos:broader	isac:estimation_method_ .
isac:kalman_filter_	skos:broader	isac:estimation_method_ .