Which method is a quantitative forecasting technique?

The Delphi method involves gathering opinions from a panel of experts to reach a consensus on future events. While it can produce insights, it is inherently qualitative and relies on subjective judgments rather than statistical analysis, thus not qualifying as a quantitative forecasting technique.

Similar to the Delphi method, the expert opinion approach seeks input from knowledgeable individuals to forecast future outcomes. This method is also qualitative in nature, as it depends on personal insights and experiences rather than quantifiable data and statistical models.

The grassroots model focuses on collecting information from individuals at the operational or community level to inform forecasts. Although it can provide valuable local insights, it remains qualitative since it relies on subjective input rather than a rigorous statistical framework.