Example of Trend Analysis

A marketing analyst wants to assess trends in tennis racquet sales. The analyst collects sales data from the previous five years to predict the sales of the product for the next 3 months.

  1. Open the sample data, TennisRacquetSales.MTW.
  2. Open the Trend Analysis dialog box.
    • Mac: Statistics > Time Series > Trend Analysis
    • PC: STATISTICS > Forecast > Trend Analysis
  3. In Y variable, enter Racquets.
  4. Under Type of model, select Quadratic.
  5. On the Forecast tab, select Number of forecasts to generate and enter 3.
  6. Click OK.

Interpret the results

The trend analysis plot shows a general upward trend. There is curvature and the model appears to fit the data well, which indicates a good fit. The analyst can be confident in the forecasts for the next 3 months.

Fitted Trend Equation
Accuracy Measures
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