這篇給出了個指標。預測QQQ>12%，上TQQQ

“Given recent volatility levels for NDX, TQQQ will underperform QQQ if NDX is up less than 9.8% over the next year. TQQQ will outperform QQQ if NDX is up more than 12%.”

QQQ 年化15%。

同理，如果VIX/VXN 降，就可以考慮上TQQQ。