Question

To make predictions for sales in a specific month, the ratio to trend method uses. (a) monthly dummy variables (b) the ratio of past sales in the month to the unadjusted trend (c) the ratio of sales to a seasonally adjusted trend (d) the ratio of monthly sales to a seasonally adjusted trend

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Answer #1

To make predictions for sales in a specific month, the ratio to trend method uses - ans. (d). the ratio of monthly sales to a seasonally adjusted trend.

To get prediction of sales in a specific month we first calculate the trend analysis of each month by least square method by taking unadjusted data of months and years. Then we take percentage average of each month corresponding to its trend value. Then we get aggregate values of ratio of that particular month or each month whatever we want to get . Then we get adjusted average ratio of that month.

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