This study analysis forecasting the bitcoin exchange rate against the USD. The dataset selected for this study starts from January 2015 to June 2022. This study's methodology uses autoregressive integrated moving average forecasting (ARIMA). The overall outcomes of this study were gathered from the statistical software Minitab 21.1. The Box Jenkins approaches are also used to predict the best model. To determine the ARIMA model parameter, this study did autocorrelation function (ACF) and partial autocorrelation function (PACF) analyses. According to the Box-Cox transformation method, log transformation was selected. The outcome demonstrates that the seasonal with the regular difference in the Bitcoin exchange rate against the USD is a stationary data series. The forecasting model used in this study is ARIMA (1,1,0) (2,1,1)12. This predicted model is identified through the Mean squared error by comparing the other guessing ARIMA models. After the prediction, 5 Month bitcoin exchange rate against the USD. Investors will be able to estimate the bitcoin exchange rate against the USD with the use of this information, but volatility must also be properly watched. This will aid investors in making better investment decisions and increase profits. In future studies, better consider another exchange rate of BTC and software experts will develop such type of software based on ARIMA models for prediction.
An autoregressive integrated moving average (ARIMA) model is useful to analyze time-series data either for better understanding or for forecasting future points in the series. This paper aims to model and forecast the GDP of Sri Lanka based on the Box-Jenkins approach based on the annual data from 1971 to 2021. Box -Jenkins technique is a relatively advanced time series forecast method it is applied in this paper to forecast GDP at the million US$ in Sri Lanka. The study attempt to study and model to forecast the GDP of Sri Lanka using an appropriate forecasting model. After testing the stationarity of the data, the series were stationary at the first difference after calculating the logarithm of the data.
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