Discrete Wavelet Transform is a data transformation method that represents data in the time domain and frequency domain. This transformation appears to overcome the weakness of the Fourier transform which is only able to provide one domain information and is limited to certain windowing. The type of wavelet used is the Haar Wavelet. Identification of data periodicity using Periodogram analysis with Fisher's Test statistics. The transformed data is decomposed into two components, namely the Approximation Coefficient and the Detail Coefficient. Both components are predicted using the Box-Jenkins ARIMA method. Model selection was carried out using the Akaike Information Criterion (AIC ) and Mean Square Error (MSE) methods. The forecast obtained is then reconstructed into the time domain (inverse). The application of the ARIMA model through wavelet transformation to Makassar City Air Humidity data for the period September 2006 - December 2012 shows that forecasting on the Approximation Coefficient obtained by the ARIMA model (0,0,3) with AIC = 112.2142 and MSE = 29.673. While forecasting on Detailed Coefficients is obtained by the ARIMA model (2,1,0) with AIC = 89.2 and MSE = 15,989.
Bahasa Indonesia
Transformasi Wavelet Diskrit merupakan metode transformasi data yang merepresentasikan data dalam domain waktu dan domain frekuensi. Transformasi ini muncul untuk mengatasi kelemahan transformasi Fourier yang hanya mampu memberikan satu informasi domain saja dan terbatas pada windowing tertentu. Jenis wavelet yang digunakan yaitu Wavelet Haar. Identifikasi keperiodikan data menggunakan analisis Periodogram dengan statistik Uji Fisher. Data hasil transformasi didekomposisi menjadi dua komponen yaitu koefisien Aproksimasi dan Koefisien Detail. Kedua komponen tersebut diramalkan menggunakan metode ARIMA Box-Jenkins. Pemilihan model dilakukan menggunakan metode Akaike Information Criterion (AIC) dan Mean Square Error (MSE). Peramalan yang diperoleh kemudian dikonstruksi kembali ke domain waktu (invers). Aplikasi model ARIMA melalui transformasi wavelet pada data Kelembaban Udara Kota Makassar periode September 2006 - Desember 2012 menunjukkan bahwa peramalan pada Koefisien Aproksimasi diperoleh model ARIMA (0,0,3) dengan nilai AIC = 112.2142 dan MSE=29.673. Sementara peramalan pada Koefisien Detail diperoleh model ARIMA (2,1,0) dengan AIC = 89.2 dan MSE=15.989.
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