English to Russian Bus/Financial Finance (general) Биржа

Как в данном контексте расшифровывается RS?

Trend Formula
Uptrend: 100-(100/1-RS) RS uptrend
Downtrend: 100+(100/1-RS) RS downtrend
RS uptrend = Sum of Gains over the past 400 periods
RS downtrend = Sum of Losses over the past 400 periods

Reversal Formula
Reversal down: 100-(100/1-RS) RS reverse down
Reversal up: 100+(100/1-RS) RS reverse up
RS reverse down = Sum of Gains over the past 400 periods
RS reverse up = Sum of Losses over the past 400 periods