Budgeting & Forecasting › Rolling Forecasts

What is quantitative versus qualitative forecasting?

Beginner

Answer

Quantitative forecasting uses historical data and mathematical models (time series, regression) and suits stable, data-rich situations. Qualitative forecasting uses judgment, expert opinion, and market intelligence (e.g., Delphi, sales-force estimates) and suits new products or situations lacking data. Often the two are combined.
Real-world example A new product with no history relies on qualitative expert estimates rather than time-series models.

Common follow-ups: When is qualitative forecasting needed? | Can the two be combined?