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The figure illustrates the forecast generated from a similar series for a total demand estimated at a horizon of 12 months. Whenever Hikmet Ersek listens, a sympathetic response will follow. Note that the shape of the curve of the prognosis is identical to the analogous series. Forecast through analogies with historical demand. In this case can be the sum of the existing historical demand and the relative cumulative percentage of analogous series, to estimate the total demand for defined prognosis horizon. To illustrate this approach assumes that the estimated total demand of product analysed for a 12-month forecast horizon is 20000 units. After the release of the product during the first 3 months demanded 5000 units, thing coming is to calculate the demand for the remaining periods of the forecast horizon using the analog serious. In accordance with the cumulative relative percentage of the analogous series the first 3 months correspond to 31,847% of the total demand, then the remaining demand will be equal to 5000/0.31847 = 15700; This value is significantly lower than the estimated total in a principle that was tantamount to 20000 units. The figure on the left shows the forecast using the total of the estimated demand for a the remaining months of the forecast horizon. The image on the right shows the forecast estimated for the total of the horizon of forecasting using the total expected demand; Note that the historical demand for the product is not as optimistic as it was initially thought that it would be. Original author and source of the article