Indonesia is the largest archipelago in the world and also the largest nation in South East Asia. As a big country which is rich of natural resources, there have been many foreign investors from Asia and Europe taking the opportunities to invest in this country. This study applied the GM (1,1) model [6,9,10,11] to predict the exchange rate between Rupiah and US Dollar from 2010/01/01 to 2010/10/18. The results presented that the average accuracy of the forecasting model exceeds 99.65%.
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