The Use and Accuracy of Holt-Winters Forecasting Method

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Introduction
Based the principle that easy and friendly to apply this model in practice to forecast C1 product of MAD Ltd, especially provide information for the people that don’t equipped with any skills on VBA and forecasting knowledge. This model using solver, Holt-Winters forecasting method and VBA to achieve automatically calculation to obtain the result of next quarter or next whole year forecast.

This report will first give a guidance on how to use this model and the accuracy of this model. Then illustrate what is forecasting system, computer programming and VBA and how these theory apply in this model. Finally, indicated the maintain process of this model, and the limitations of this model if user want to conduct further process

Guidance of this forecasting model

In order to obtain accuracy amount of C1 product of next quarter, manager should insert the observation data of current quarter of C1 amount first by click the bottom at the front of the excel. Then it will ask user to insert the data of current quarter sales amount. Tap in actual number of current quarter sales amount, then excel will ask user to make sure the data had been taped in is correct, if its incorrect, model will be exist automatically, user should press the bottom again to insert correct data. If the data had been inserted is correct, excel will show up a result output box which is due to excel running solver to minimum error of forecasting error. Finally, excel will come out a message box of C1 product of next quarter forecasting amount and forecasting total cost.

As the data is updating quarterly, update current quarter sale units will improve the accuracy to predict next quarter sales unit. This model assumes MAD Ltd will forecasting next who...

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...ghly simplified and automatic. Based on setting, it fit to MAD Ltd Company for long-term running without complicated input steps and frequent maintaining activities.

However, there still exit certain disadvantages. As this model mostly is provide figures, which hard to compare and illustrate errors among actual observation, quarterly forecast and annually forecast. Therefore, using line graph could clearly illustrate the tendency and differences among these variables. User have to change the data of the line graph that are provided in excel file.

Based on MAD Ltd Company’s C1 product situation, design this forecasting process to gain optimise result to forecast C1 product face to people from different background. For future work, this model could also apply for other products that have trend and seasonality, to improve their accuracy and reduce operation cost.

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