Abstract:
Mobile accessories have many different types and functions to be able to help perfect
the performance of the phone. Retro cellular Bangkinang is one of the places to provide
sales of cellphone accessories. The store sells many types of cellphone accessories that
make it difficult to control old inventory that is not sold. With so many types of
cellphone accessories, the stock of goods is out of control. This is caused by an error in
increasing the number of goods to the accumulation of stock of goods. Product
forecasting is a form of inventory control so that the amount of inventory can be
controlled. The method used to forecast sales of HP accessories using the single moving
average method. The calculation data used is sales data for the last 12 months. The
calculation is carried out using periods 5, 7, and 9. Then to measure the error rate that
occurs after calculations using equations from MAD, MSE, and MAPE. The forecasting
results can be in the form of the number of sales of goods that will be sold in June 2023.
The smallest measuring value of the forecasting error rate is forecasting on PowerBank
goods with MAD values of 0.99, MSE 1.42, and MAPE 4.24. The measurement value of
the largest forecasting error rate is in the type of Case Motive goods with a value of
MAD 218.51, MSE 59979.48, and MAPE 74.20.
