OPEN-SOURCE SCRIPT
Relative Strength Spread
SPY vs IWM Relative Strength Spread Indicator
The SPY vs IWM Relative Strength Spread indicator measures leadership between large-cap and small-cap equities by comparing the percent performance of SPY (S&P 500) against IWM (Russell 2000) over a user-defined lookback period.
The indicator plots a zero-centered histogram in a separate pane, making relative strength shifts immediately visible.
How It Works
The indicator calculates the percent change of SPY and IWM over the same lookback window.
It then subtracts IWM’s percent change from SPY’s percent change.
The result is plotted as a histogram pinned to the 0% line.
This design removes long-term drift and ensures that:
Positive values indicate SPY is outperforming IWM
Negative values indicate IWM is outperforming SPY
How to Read the Histogram
Above Zero (Green Bars)
Large-cap stocks are leading → typically associated with risk-on stability and institutional flow into SPY-weighted names.
Below Zero (Red Bars)
Small-cap stocks are leading → often signals risk appetite expansion and speculative participation.
Crosses of the Zero Line
Mark potential leadership transitions between large caps and small caps.
Why This Indicator Is Useful
Identifies market regime shifts (risk-on vs risk-off behavior)
Confirms or filters trend strength in equities
Helps time rotations between large-cap and small-cap exposure
Works consistently across all timeframes
Because the calculation is based on percent change, the histogram remains normalized and comparable regardless of price level or timeframe.
Best Use Cases
As a market internals / breadth confirmation tool
As a bias filter for SPY, IWM, or index futures
To spot early leadership changes before price trends fully develop
The SPY vs IWM Relative Strength Spread indicator measures leadership between large-cap and small-cap equities by comparing the percent performance of SPY (S&P 500) against IWM (Russell 2000) over a user-defined lookback period.
The indicator plots a zero-centered histogram in a separate pane, making relative strength shifts immediately visible.
How It Works
The indicator calculates the percent change of SPY and IWM over the same lookback window.
It then subtracts IWM’s percent change from SPY’s percent change.
The result is plotted as a histogram pinned to the 0% line.
This design removes long-term drift and ensures that:
Positive values indicate SPY is outperforming IWM
Negative values indicate IWM is outperforming SPY
How to Read the Histogram
Above Zero (Green Bars)
Large-cap stocks are leading → typically associated with risk-on stability and institutional flow into SPY-weighted names.
Below Zero (Red Bars)
Small-cap stocks are leading → often signals risk appetite expansion and speculative participation.
Crosses of the Zero Line
Mark potential leadership transitions between large caps and small caps.
Why This Indicator Is Useful
Identifies market regime shifts (risk-on vs risk-off behavior)
Confirms or filters trend strength in equities
Helps time rotations between large-cap and small-cap exposure
Works consistently across all timeframes
Because the calculation is based on percent change, the histogram remains normalized and comparable regardless of price level or timeframe.
Best Use Cases
As a market internals / breadth confirmation tool
As a bias filter for SPY, IWM, or index futures
To spot early leadership changes before price trends fully develop
开源脚本
秉承TradingView的精神，该脚本的作者将其开源，以便交易者可以查看和验证其功能。向作者致敬！您可以免费使用该脚本，但请记住，重新发布代码须遵守我们的网站规则。
免责声明
这些信息和出版物并非旨在提供，也不构成TradingView提供或认可的任何形式的财务、投资、交易或其他类型的建议或推荐。请阅读使用条款了解更多信息。
免责声明
这些信息和出版物并非旨在提供，也不构成TradingView提供或认可的任何形式的财务、投资、交易或其他类型的建议或推荐。请阅读使用条款了解更多信息。