The Delphi method is a qualitative forecasting approach based on expert judgment. Because it depends heavily on opinions from selected experts, it is more subjective than quantitative techniques such as seasonal analysis and time series forecasting.
The forecasting material shows that quantitative methods rely on historical demand patterns. Exact extract: “Three-month moving averages are found by taking the actual demand for the last three months divided by three.”
The material also explains seasonal analysis quantitatively. Exact extract: “Estimating how much demand exists above or below the average demand of a product during a season the seasonal demand index aids companies in planning inventory.”
Therefore, among the choices, the Delphi method is the most subjective because it is based on expert opinion rather than direct numerical demand history.
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