Complete the following steps to specify the column of data that you want to analyze.
If you do not know the seasonal length, use or to help you identify the length.
Use autocorrelation to determine whether lags are significantly correlated.
To identify the trend, use .
In this worksheet, Sales contains the number of computers that are sold each month.
C1 |
---|
Sales |
195000 |
213330 |
208005 |
249000 |
237040 |
For other cases, you usually do not include the constant term.