| Summary: | 碩士 === 國立臺北大學 === 企業管理學系 === 103 === Enterprise management is a dynamic and continuous investment behavior. Among the issues between investment behavior and financial management, the supply and demand of net working capital is a key factor. Throughout the investigation of the supply, demand and shortage of net working capital, we could diagnose a company’s capital flow and financial operation quality. In this study, two firms, HEY-SONG and TAI-YEN, within the Taiwan beverage industry are selected. The quarterly data, ranging from 2008 to 2014, of net revenue, the supply, demand and shortage of working capital were collected. Using the SAS X-11 classical time series decomposition model, stable and moving seasonality tests are examined. The X-11 forecasting models are constructed and the forecasting accuracy is checked for all variables using the MAPE index. The conclusions are as follows:
1. The seasonal stability tests show that there are significant differences in some of variables.
2. The seasonal mobility tests show that there are significant differences among these four variables.
3. The MAPE for all research variables are less than 2%, indicating the forecasting model is very accurate and useful.
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