Pengaruh investment opportunity set pada kebijakan dividen dengan struktur kepemilikan sebagai variabel dummy (studi pada perusahaan go public di sektor non-keuangan yang terdaftar di Bursa Efek Indonesia periode 2006-2011) = The effect of investment opportunity set on dividend payout policy with ownership structure as dummy variable (study on non financial sector companies listed in Indonesia Stock Exchange for the period of 2006-2011)