Open AccessPERAMALAN CURAH HUJAN MENGGUNAKAN METODE ANALISIS SPEKTRAL
Author(s) -
Ni Putu Mirah Sri Wahyuni,
I Wayan Sumarjaya,
I Gusti Ayu Made Srinadi
Publication year - 2016
Publication title -
e-jurnal matematika
Language(s) - English
Resource type - Journals
ISSN - 2303-1751
DOI - 10.24843/mtk.2016.v05.i04.p139
Subject(s) - periodogram , spectral analysis , series (stratigraphy) , time series , frequency domain , meteorology , mathematics , climatology , statistics , environmental science , geography , geology , physics , mathematical analysis , paleontology , quantum mechanics , spectroscopy
The purpose of this research is the model of forecasting rainfall using spectral analysis method. To obtain complete information on characteristics of time series data we need to examine periodicity of the data. Examining the periodicity of time series data in the frequency domain is called spectral analysis. The results of spectral analysis show that periodogram is clearly dominated by a very large peak at frequency . This frequency corresponds to period of 12 cycle per month. Based on the results of analysis of time series data rainfall is SARIMA (0,1,1)(0,1,1)12 where the model can be written as The result indicates minimum rainfall happen in January and maximum rainfall happen in August.