Studies · Momentum
Stochastic Momentum Index (SMI)
stochasticMomentumIndex · Blau's SMI — the close against the range midpoint, smoothed
Drawn in its own panelReads high, low, closeGuide lines at -40, 40
Hover the chart to read values · practice data: a seeded random walk with no overnight gaps
What it measures
A refined stochastic. Instead of measuring the close from the bottom of the range it measures it from the middle, so the result is signed: +100 at the top of the range, −100 at the bottom, 0 in the middle. Both parts are smoothed twice, which makes it much quieter than the plain stochastic.
How traders use it
- Overbought above +40 and oversold below −40 are common thresholds.
- Crossovers of the SMI and its signal line as entries.
- Zero-line crossings as a trend change.
Parameters
| Name | Value | Default | Allowed | What it does |
|---|---|---|---|---|
| period | 13 | ≥ 1 usual 5–30 | Look-back window for the high-low range. | |
| longPeriod | 25 | ≥ 1 usual 3–50 | First smoothing (EMA) length. | |
| shortPeriod | 2 | ≥ 1 usual 1–10 | Second smoothing (EMA) length. | |
| signalPeriod | 3 | ≥ 1 usual 1–15 | EMA of the SMI used as the signal line. |
Outputs
| Value | The SMI line. |
| Signal | An EMA of the SMI. |
Drawn in one colour, one line per output, told apart by line texture. Hover the chart to read each one.