Effectiveness of Single and Double Exponential Smoothing: SES, ARRSES and Holt’s Linear for Time Series Data Prediction with Trend and Non-seasonal Characteristic (Covid-19 Vaccinate Case): Efektivitas Metode Exponential Smoothing untuk Prediksi Data Runtun Waktu Pola Tren dan Non-musiman (Studi Kasus Cakupan Vaksinasi Covid-19). JMSK. 2023;20(1):52-64. doi:10.20956/j.v20i1.27193