tailieunhanh - Engineering Statistics Handbook Episode 8 Part 12

Tham khảo tài liệu 'engineering statistics handbook episode 8 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Seasonality ENGINEERING STATISTICS HANDBOOK hW tools raids lỉEÂtCH BACK Nixf 6. Process or Product Monitoring and Control . Introduction to Time Series Analysis . Univariate Time Series Models . Seasonality Seasonality Many time series display seasonality. By seasonality we mean periodic fluctuations. For example retail sales tend to peak for the Christmas season and then decline after the holidays. So time series of retail sales will typically show increasing sales from September through December and declining sales in January and February. Seasonality is quite common in economic time series. It is less common in engineering and scientific data. If seasonality is present it must be incorporated into the time series model. In this section we discuss techniques for detecting seasonality. We defer modeling of seasonality until later sections. Detectm he following graphical techniques can be used to detect seasonality. Seasonality 1. A run sequence plot will often show seasonality. 2. A seasonal subseries plot is a specialized technique for showing seasonality. 3. Multiple box plots can be used as an alternative to the seasonal subseries plot to detect seasonality. 4. The autocorrelation plot can help identify seasonality. Examples of each of these plots will be shown below. The run sequence plot is a recommended first step for analyzing any time series. Although seasonality can sometimes be indicated with this plot seasonality is shown more clearly by the seasonal subseries plot or the box plot. The seasonal subseries plot does an excellent job of showing both the seasonal differences between group patterns and also the within-group patterns. The box plot shows the seasonal difference between group patterns quite well but it does not show within group patterns. However for large data sets the box plot is usually easier to read than the seasonal subseries plot. Both the seasonal subseries plot and the box plot assume that the http .

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