What is time series and its types?

An observed time series can be decomposed into three components: the trend (long term direction), the seasonal (systematic, calendar related movements) and the irregular (unsystematic, short term fluctuations). WHAT ARE STOCK AND FLOW SERIES? Time series can be classified into two different types: stock and flow .

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What is one step ahead forecasting?

One-step ahead forecasts are computed sequentially for each data point by using computed level and trend states for the current point, and seasonal states for the last seasonal period . Forecast error is computed by subtracting forecast value at the previous point from the observed value at the current point.

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