Abstract
Publisher Summary This chapter discusses the fundamental concepts of quantitative forecasting and predictions. Forecasting is the act of predicting the future, whether it is based on historical data or speculation about the future when no history exists. When historical data exist, a quantitative or statistical approach is best, but if no historical data exist, then a qualitative or judgmental approach is usually the only recourse. Forecasting can be divided into quantitative and qualitative approaches. Qualitative forecasting is used when little to no reliable historical, contemporaneous, or comparable data exist. Several qualitative methods exist such as the Delphi or expert opinion approach and management assumptions, as well as market research or external data or polling and surveys.
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