When I generate a statistical forecast through background, for few combinations log showing as "Forecast values will be negative", why and on what basis forecast will generates negative forecast.
Your results have a negative trend and the results will be negative within the forecast horizon. (sample history: 84, 76, 62, 55, 43 - a trend model will see the negative trend and forecast 3x, 2x, 1x, -x, -1x, -2x)
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