@book{231994,
	author = {Cramer, Duncan, and Howitt, Dennis. and ebrary, Inc.},
	title = {The Sage dictionary of statistics},
	publisher = {Sage Publications,},
	year = {2004.},
	address = {Thousand Oaks, CA ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10218033}
}