long_avg

This indicator helps you quickly see whether the series has a stationary
mean. For reference, view the indicator on VIX, which is thought to have a
long-term stationary mean. Best used on a monthly chart, since these won't
irritate the candle limit.

The red line traces the long-run mean of the series over time, while the blue
indicates its present value. The purple lines are one-standard deviation from
the mean.