I have multiple time-series data over the same timespan (from 1989 to 2019) at an interval of 3 years. I want to forecast for 2022. I have changed the timeline data into date type and defined the date and time criteria as expected in SPSS.
However, whenever SPSS tries to forecast from the time series, the timeline changes from triennial to annual (1989, 1992, 1995 to 1989, 1990, 1991). Can anyone tell me what is going wrong here? Is this the limitation of SPSS that it can't handle time series having intervals more than annual? or am I missing something?
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Polash Banerjee
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#SPSSStatistics