Time series are particularly useful to track variables such as revenues, costs, and profits over time. Time series models help evaluate performance and make predictions. Consider the following and respond in a minimum of 175 words:
YearGross Federal Debt ($millions)
1945260,123
1950256,853
1955274,366
1960290,525
1965322,318
1970380,921
1975541,925
1980909,050
19851,817,521
19903,206,564
19954,921,005
20005,686,338
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