http://www.quantlet.com/mdstat/scripts/mva/htmlbook/mvahtml.html
http://www.socialresearchmethods.net/tutorial/flynn/multivar.htm
http://www.statsoft.com/textbook/stfacan.html
http://www.xplore-stat.de/ebooks/ebooks.html
http://www.quantlet.com/mdstat/scripts/mva/htmlbook/mvahtml.html
http://www.socialresearchmethods.net/tutorial/flynn/multivar.htm
http://www.statsoft.com/textbook/stfacan.html
http://www.xplore-stat.de/ebooks/ebooks.html