Sales forecasting expert witnesses may testify on sales promotions, retail sales, sales revenues and more. Referenceforbusiness.com describes QUALITATIVE FORECASTING METHODS.
Qualitative forecasting techniques generally employ the judgment of experts in the appropriate field to generate forecasts. A key advantage of these procedures is that they can be applied in situations where historical data are simply not available. Moreover, even when historical data are available, significant changes in environmental conditions affecting the relevant time series may make the use of past data irrelevant and questionable in forecasting future values of the time series.
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