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PERBANDINGAN METODE ARIMA DAN MODEL FUNGSI TRANSFER UNTUK MERAMALKAN CURAH HUJAN DI JAWA TENGAH PERIODE TAHUN 2023-2024

*Haniatul Mutamakkinah  -  Departemen Statistika, Fakultas Sains dan Matematika, Universitas Diponegoro, Indonesia
Rukun Santoso  -  Departemen Statistika, Fakultas Sains dan Matematika, Universitas Diponegoro, Indonesia
Tarno Tarno  -  Departemen Statistika, Fakultas Sains dan Matematika, Universitas Diponegoro, Indonesia
Open Access Copyright 2024 Jurnal Gaussian under http://creativecommons.org/licenses/by-nc-sa/4.0.

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Abstract

Analysis data of time series is basically used for analysis data that makes the effect of observations on the previous period. The role of forecasting has explored various fields, including the field of meteorology which concerns weather forecasting. The ARIMA model is a forecasting model for analyzing single time series data and only look into the dependence of rainfall on past data without involving other variables. The transfer function has an output tier (yt) which is expected to be affected by the input tier (xt) or other inputs which called the noise tier (nt). The purpose of this research is to find out which method is most appropriate to use in forecasting rainfall in the region of Central Java. Forecasting results with the transfer function model will be compared with the rainfall ARIMA model in Central Java to find out which method is more preferable. The data used in the research are rainfall data and air temperature, in Central Java from January 2016 to December 2022. The results showed that the MAPE value with transfer function model is 38,21%, while the ARIMA model has an MAPE value of 43,23%. From the MAPE value we can conclude that transfer function method is the best forecasting model for rainfall forecasting rather than ARIMA, because the MAPE value is tinier.

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Keywords: ARIMA; MAPE; Rainfall; Transfer Function

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