1. Example 2.10 Time Series Plots

2. 2.12.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2.9 | 2.11 | 2.122.22.32.42.52.62.72.82.92.112.12 TWOVARS.XLS n Consider a company that sells two products. Product 1 is a much better seller than product 2. The spreadsheet contains monthly revenues for the two products. n The monthly revenues from product 1 are typically above $100,000, whereas the revenues from product 2 are typically around $5000. n How can the time behavior of these revenues be shown on a single chart in a meaningful way?

3. 2.12.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2.9 | 2.11 | 2.122.22.32.42.52.62.72.82.92.112.12 Comparing Time Series Behavior n Sometimes it is useful to plot two time series variables on the same chart to compare their time series behavior. n StatPro allows you to do this by selecting two time series variables to plot. n If the data for the two variable are of completely different magnitudes, StatPro provides the option of using different vertical scales.

4. 2.12.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2.9 | 2.11 | 2.122.22.32.42.52.62.72.82.92.112.12 Creating a Time Series Plot n To create a time series plot, we must use StatPro’s Time Series Plot menu item. This procedure allows us to plot one or more time series variables on the same chart. The following is the key dialog box.

5. 2.12.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2.9 | 2.11 | 2.122.22.32.42.52.62.72.82.92.112.12 Creating a Time Series Plot -- continued n In this example we want to plot two variables, revenues for Product 1 and revenues for Product 2. Select these two variables. n Since the data for these variables differ in magnitude it is best to use different vertical scales. n This technique prevents Product 1 revenues from dominating the chart and making Product 2 revenues hardly visible. n The following is the time series plot with different vertical scales.

6. 2.12.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2.9 | 2.11 | 2.122.22.32.42.52.62.72.82.92.112.12 Time-Series Plot- Separate Scales