Analisis hubungan jangka panjang variabel kurs, inflasi, tingkat suku bunga dan harga komoditas batubara, crude palm oil (CPO), minyak bumi terhadap indeks harga saham gabungan periode 2010-2016 = The analysis of long term relationship of exchange rate, inflation, interest rate, and commodity price of coal, crude palm oil, and petroleum to composite stock price index period 2010-2016