EXAMPLE 20 Time Series “Strip Plot”
Purpose: Describe a technique for visually displaying very long time series.
First, let’s get some long time series data. During a drought a couple of years ago, our local water supply lakes were having trouble keeping up with the water demand, and their levels were dangerously low. I was curious whether the levels had been that low in any previous years, and I found the historical lake level data and created this plot to answer my question.
Jordan Lake, near Raleigh, NC, is maintained by the Army Corps of Engineers. They monitor the lake level and make that data available on a Web page. You can actually read the data directly from their Web site using the SAS FILENAME statement URL access method, or you ...