Relative Strength

Relative strength is calculated as the ratio of the active symbol vs the symbol selected in the Relative Strength indicator (the S&P 500 index on the chart below).

When the relative strength line is moving up, the active symbol is outperforming the RS symbol and under-performing when the line is moving down.

Sometimes referred to as a "ratio chart".

The chart below has a Comparison plot of the S&P 500 overlayed on AAL to illustrate how AAL is outperforming the S&P 500 when the RS indicator is moving up and underperforming when the RS plot is moving down.