Rothman epidemiologybook
stratified analysis
by greenland sander.
googlebooks.
http://books.google.sk/books?id=Z3vjT9ALxHUC&pg=PA283&lpg=PA283&dq=interaction+versus+stratified+analysis&source=bl&ots=aOMKdIWH9T&sig=BvQKFnUsjzqtUO4hMImdFX0o4cQ&hl=sk&ei=RpUoTOGbNISWONSypasC&sa=X&oi=book_result&ct=result&resnum=7&ved=0CEIQ6AEwBg#v=onepage&q=interaction%20versus%20stratified%20analysis&f=false
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