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True strength index

Momentum with the noise smoothed out twice: which way the moves lean, how hard, and the latest crosses. From your closes.

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The closes

Oldest first, separated by commas or spaces. With the usual settings, at least 45.
Blau used 25.
Blau used 13.
7 is common.

The true strength index

The TSI is +46.6, above zero: the smoothed moves are mostly up.

Stretched?
Above +25, a reading many traders treat as stretched up.
The signal line
It is above its signal line (+40.9), which was +39.0 on the bar before; the TSI was +44.7.
The crosses
The TSI last crossed above its signal line 33 bars ago. It last crossed above zero 20 bars ago.
Read it with care
Two averages make it smooth but late: a cross confirms a turn that has already started. In a strong trend the TSI can stay stretched for a long time.

The TSI (25, 13) and its 7-bar signal line on the last bars. The last bar is marked.

BarClose priceTSISignal line
5 ago2,399.10+36.4+31.0
4 ago2,412.50+38.6+32.9
3 ago2,430.80+41.4+35.0
2 ago2,427.40+43.1+37.1
1 ago2,432.40+44.7+39.0
Last2,443.60+46.6+40.9

Education only, not investment advice. The answer comes from the numbers you typed in, not from your account or the market. Simulated results are hypothetical and have limits: real trading has slippage, gaps, changing results and emotions. Trading leveraged products can lose money quickly, including all of it. Risk warning

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Educational only, not financial advice; trading involves risk.

Momentum, smoothed twice

William Blau's true strength index takes each bar's change in price, smooths it with a 25-bar and then a 13-bar exponential average, and divides by the same smoothing of the size of the changes. The result runs from -100 to +100: above zero the moves lean up, below zero they lean down. A signal line, usually 7 bars, gives the crosses, and many traders treat readings beyond 25 either way as stretched.

Compare it with the RSI calculator, the MACD calculator and the percentage price oscillator.

Not advice. Arithmetic on the closes you type; past readings do not promise future ones.

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