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PerfCharts Performance Value For A Given Date Changes Simply by Moving the Date Range Slider
I have noticed an anomaly in the PerfChart of StockCharts.com.
I am attaching two screenshots in SPY Perf.zip (not able to attach more than one screenshot so had to zip them) that illustrate this:
* SPY Perf 02-15-2019.png - Shows the 252 day performance of SPY on 01/31/2019 to be +2.03%. This was captured today with the hard right edge of the chart = 02/14/2019.
* SPY Perf 01-31-2019.png - Shows the 252 day performance of SPY on 01/31/2019 to be -2.43%. This was also captured today with the hard edge edge of the chart = 01/31/2019, and was what I saw around 01/31/2019.
By just scrolling the 252 day (or any other period) date range to reflect a different hard right edge, the performance can greatly change. I am not understanding why a past performance value would change in this way - shouldn't these be fixed throughout time?
Can anyone help clarify this behavior?