Analisis hubungan harga minyak, nilai tukar rupiah terhadap dolar Amerika Serikat, dan indeks harga saham gabungan dengan menggunakan vector autoregressive (VAR) periode Januari 2008-Desember 2017 = Analysis of the relationship between oil prices, rupiah exchange rates against the United States dollar, and the composite stock price index using the vector autoregressive (VAR) period January 2008-December 2017