Pemodelan Peramalan Penjualan Pakan Udang pada PT Central Proteina Prima, TBK dengan Metode Pemulusan Eksponensial (Exponential Smoothing)

Abstract

Exponential smoothing basically pave the past data by performing weighting decreases exponentially with observed values of older or value of newer assigned a weighting that is relatively larger than the value of observation is longer and consider the random influences, trends, seasonality on past data that will be smoothed in the selection method used yaang. By analyzing the pattern of data on sales data PT Central protein Prima, Tbk using Plot Data, Correlation Coefficient, and Test Seasonal then the pattern data contained are data patterns seasonal so used the smoothing method of exponentially three parameters: Methods Winter in the completion of the problem in this study. To suppress the forecasting error made trial and error to obtain the smallest MSE value of value parameters are used. The smallest MSE value obtained for 66. 131.08 with parameter values α = 0.4; β = 0.1; and ɣ = 0.1. By using the exponential smoothing three parameters: Methods Winter of the obtained equation to predict the next season as follows. m m F xm I 60 48 1.263,66 1,32 By entering a value m = the period ahead, the obtained value of forecasting: January = 1168.58, February = 1346.10, March =1214.16, April = 1253.96, May = 1475.51, June = 1496.75, July = 1420.12, August = 1.365, 69, September = 1247.89, October =1305.28, November= 1303.06 , and December = 1,091, 99. Comparison of the accuracy of forecasting using exponential smoothing three parameters: Methods Winter with Subjective Methods is used for this is to compare the value of MAPE obtained from each forecasting. By using the exponential smoothing three parameters: Methods Winter obtained MAPE by 15, 25, whereas with forecasting subjective method is used for this value amounted to 28.93 MAPE so that it can be concluded exponential smoothing three parameters: Methods Winter has a better forecasting accuracy.