Time series analysis requires handling issues like seasonality and trends from "summary" of Introduction to Econometrics by Christopher Dougherty
When analyzing time series data, one must be aware of the presence of seasonality and trends. Seasonality refers to patterns that repeat at fixed intervals, such as daily, weekly, monthly, or yearly. For example, retail sales tend to increase during the holiday season each year. Trends, on the other hand, refer to long-term movements in data over time. This could be an upward or downward trend in a variable like GDP over several years. Seasonality and trends can complicate the analysis of time series data because they can mask the underlying relationships between variables. If these patterns are not accounted for, the results of the analysis may be misleading. For instance, failing to adjust for seasonality in sales data could lead to inaccurate forecasts and decisions by a business. To conduct a proper time series analysis, one must first identify and address seasonality and trends in the data....
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