OptiNod Academy
True Strength Index (TSI) — Time spent above zero reveals whether a trend can persist
Read TSI through its time above the zero line, slope and divergence to distinguish a lasting trend from weakening momentum.
Before looking for a crossover, use TSI to check whether price changes have continued in one direction for long enough.
The True Strength Index (TSI) does more than inspect each price change once. It smooths both price changes and their absolute values twice, then compares them. It reacts more slowly than the sharp moves in RSI and shows the direction of price changes more smoothly than an indicator based only on the gap between moving averages, such as MACD.
Many traders use TSI only for signal-line crossovers, as they would MACD: buy on an upward cross and sell on a downward cross. This approach breaks down first in a range. When price keeps moving around the 20-period EMA and TSI repeatedly crosses zero, signal-line crosses multiply, and so do stop-outs.
To use TSI well, start with the zero line. The same upward crossover has a very different meaning above zero than below it. Above zero, it may mark recovery from a pullback. Below zero, it may merely mark a rebound in a bearish market.
Time spent above zero distinguishes a trending market
TSI above zero means recent price changes have moved upward more consistently than downward. More important than a single move through zero is how long the indicator stays there without turning back.
In practice, count how many of the last 20 bars TSI spent above zero. If it was above zero for at least 12 bars and price is also above the 20-period EMA, one downward TSI crossover is more naturally treated as a possible normal pullback than an immediate exit. If TSI stayed above zero for fewer than half those bars, it behaves more like range-bound oscillation than a trend filter.
By contrast, an upward crossover below zero is often a bear-market rebound. If price cannot break the previous high and TSI stalls near zero, the crossover is weak evidence for a new long. It may be a point to take partial profits on an existing short or to wait for the next decline.
Read a signal-line crossover alongside location and slope
The crossover itself is not the problem; treating it as an independent signal is. A cross becomes meaningful only after checking its location, slope and price structure.
In an uptrend, the most natural setup is for price to make higher highs and higher lows while TSI dips above zero and then crosses back above its signal line. The cross then confirms the end of a pullback. Better still, TSI remains above zero throughout, dipping just below its signal line before recovering.
Entry: Price makes a higher low above the 20-period EMA, and TSI crosses back above its signal line while staying above zero.Stop: Place it below the pullback low associated with the signal.Invalidation: Abandon the continuation idea if TSI falls below zero within five bars of entry or price closes below the previous low.Management: Stop adding if price makes a new high while TSI makes a lower high.
Parameter lengths change its role as an entry signal or holding filter
Because TSI uses two smoothing passes, its period settings matter greatly. Shorter settings make it respond more like RSI; longer settings make it lag more like MACD. A combination of 25/13 smoothing and a 7-period signal line is reasonable for a medium-term view, but may be late for five-minute scalping while serving as a useful noise filter for daily swing trades.
When shortening the periods, tighten the requirements for staying above zero as well. A fast TSI crosses zero more often. Entering on one zero-line break with a 10-period TSI therefore invites many whipsaws. For a fast setting, conditions such as three bars above zero, a close above the previous price high, and ADX above 20 help maintain signal quality.
Longer settings react later, but can help you hold a larger trend. While a slow TSI stays above zero, every small down candle or short-term RSI overbought reading need not trigger an exit. If you change the periods without deciding the indicator's job, you may use the same TSI as an entry trigger one day and a holding filter the next.
Divergence is a risk-management signal before it is a reversal signal
TSI divergence is clear when price makes a new high but TSI makes a lower high. Price is still rising, but its upward momentum is weakening.
Opening a short immediately can be too early. In strong trends, several divergences may accumulate while price continues higher. It is safer to use TSI divergence as a reason to stop adding longs, raise the stop, or take partial profits.
Set practical steps in order. At the first lower TSI high, stop adding. If a second lower high appears and price breaks the previous pullback low, reduce the position. If TSI then fails to hold zero, treat the trend as damaged. This sequence reduces the mistake of using divergence as a premature reversal entry.
Filter out the conditions where TSI loses meaning
TSI is weakest in a narrow range. If price keeps crossing the 20-period EMA and TSI barely oscillates around zero, signal-line crosses are mostly noise. Turn it off in that environment, or wait until the Choppiness Index falls and price closes outside the top or bottom of the range.
A second weakness is a sudden event candle. News, earnings or a liquidation event can produce a large price change in one or two bars, and TSI catches up late. If an upward TSI cross appears just after the event candle, price may already be at an entry with poor reward relative to risk. Instead, wait for the next pullback and reassess whether TSI holds zero.
A third weakness is very low volatility. Small price changes can make the TSI lines look smooth without providing enough range for an attractive reward-to-risk ratio. When ATR is below its average over the past 30 bars and volume is falling, a good-looking TSI may still leave little room before the target.
Give TSI a role between MACD and RSI
If you use TSI alongside MACD and RSI, give each a distinct job. RSI quickly shows overbought and oversold conditions. MACD confirms trend changes later. TSI sits between them, asking whether the direction of price changes remains intact.
A sensible combination is to set direction with the 50-period EMA and price structure, confirm a suitable environment through TSI staying on one side of zero, and manage overextension or partial profits with RSI or price divergence. If their jobs overlap, you are looking at the same information three times. If they differ, the overall signal is more stable.
Ask how long TSI stays on each side of zero before asking whether its lines crossed. That shift turns TSI from a simple reversal trigger into a filter for holding a trend and recognizing recovery from a pullback.
Advanced: TSI normalizes price changes against absolute changes
Normalization is where TSI differs from MACD. MACD takes the difference between moving averages directly, so price units and volatility affect it substantially. TSI smooths price changes twice, does the same for their absolute values, then compares the results. Rather than measuring only how far price rose, it measures how consistently recent movement favored the upward direction.
That design changes the interpretation when volatility suddenly increases. Even if price rises sharply, absolute price changes also increase when swings in both directions grow. TSI may therefore rise less than expected: price moved far, but the direction was not clean.
TSI also differs from RSI. RSI compares the relative strength of upward and downward closes and reacts quickly to overbought or oversold conditions. TSI smooths price changes more heavily, so time spent above zero and changes in slope suit it better than rapid overbought or oversold readings. Even if RSI remains above 70 in an uptrend, a stable TSI above zero can support holding the trend.
Use that distinction in practice. If price makes higher highs and MACD is positive but TSI repeatedly stalls near zero, the move may be a choppy rebound rather than a clean trend expansion. Conversely, even when RSI says overbought, rising TSI highs above zero may favor raising the stop and holding over an immediate exit.