Historigram | Time Series Analysis - Basic Statistics and Data Analysis
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the first step in analyzing a time series is to plot the given series on a graph taking time intervals ($t$) along X-axis (as an independent variable) and the observed value ($Y_t$) on Y-axis (as the dependent variable: as a function of time)
A first step in the prediction (or forecast) of a time series involves an examination of the set of past observations.
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