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They make forecasts based on both present and past values of the variables. Stated in non-technical terms, they assume that somehow history repeats itself, i.e. that some patterns in the time series behavior of data are recurrent. As a consequence, the past is useful to predict the future.
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we can use timeseries in forecasting future values depending upon current and past values. we can also construct ACF and PACF plots and can know how many spikes are there in linear stationary models.
decide means - to think carefully about the different possibilities that are available and choose one of them.Decide is a regular verb the past and past participle are decided.
A conglomerate is a company that owns many different types of businesses.