Volatility

`ta.atr(high, low, close, length)` - Average True Range

Wilder-smoothed (RMA) average of the true range. Returns a positive scalar representing volatility in price units.

onBar(() => {
  const atr = ta.atr(ctx.high, ctx.low, ctx.close, 14);
  plot("ATR14", atr);
});

`ta.stdev(source, length)` - Standard deviation

Population standard deviation of source over length bars.

onBar(() => {
  plot("StDev20", ta.stdev(ctx.close, 20));
});

`ta.variance(source, length)` - Variance

Square of the standard deviation: stdev^2.

onBar(() => {
  plot("Variance", ta.variance(ctx.close, 20));
});

`ta.dev(source, length)` - Mean absolute deviation

Average absolute distance from the mean. Less sensitive to outliers than standard deviation.

onBar(() => {
  plot("MAD", ta.dev(ctx.close, 20));
});

`ta.bb(source, length, mult)` - Bollinger Bands

Returns { upper, middle, lower }. middle is the SMA; upper/lower are middle ± mult * stdev.

const upper = plot("BB Upper", null, { color: "#3b82f6FF" });
const lower = plot("BB Lower", null, { color: "#3b82f6FF" });
plot("BB Middle", null, { color: "#3b82f680" });
fill(upper, lower, { color: "#3b82f615" });

onBar(() => {
  const bb = ta.bb(ctx.close, 20, 2);
  if (na(bb.upper)) return;
  plot("BB Upper",  bb.upper);
  plot("BB Middle", bb.middle);
  plot("BB Lower",  bb.lower);
});

`ta.keltner(source, high, low, close, length, mult)` - Keltner Channel

Returns { upper, middle, lower }. middle is the EMA of source; bands are middle ± mult * ATR.

plot("KC Upper",  null, { color: "#f59e0bFF" });
plot("KC Lower",  null, { color: "#f59e0bFF" });
plot("KC Middle", null, { color: "#f59e0b80" });

onBar(() => {
  const kc = ta.keltner(ctx.close, ctx.high, ctx.low, ctx.close, 20, 1.5);
  if (na(kc.upper)) return;
  plot("KC Upper",  kc.upper);
  plot("KC Middle", kc.middle);
  plot("KC Lower",  kc.lower);
});

Squeeze momentum setup

Combining BB and Keltner to detect low-volatility “squeeze”:

onBar(() => {
  const bb = ta.bb(ctx.close, 20, 2);
  const kc = ta.keltner(ctx.close, ctx.high, ctx.low, ctx.close, 20, 1.5);
  if (na(bb.upper) || na(kc.upper)) return;

  // Squeeze = BB inside KC
  const squeeze = bb.upper < kc.upper && bb.lower > kc.lower;
  bgcolor(squeeze ? "#a78bfa15" : null);
});

Bollinger Bands example

Full working BB indicator with band shading.

Oscillators

Momentum and oscillator functions.

Aggregators

ta.highest and ta.lowest for range-based calculations.

Getting Started

Core Concepts

Plotting

Drawing Entities

Technical Analysis

Utility Namespaces

Examples

Reference

`ta.atr(high, low, close, length)` - Average True Range

`ta.stdev(source, length)` - Standard deviation

`ta.variance(source, length)` - Variance

`ta.dev(source, length)` - Mean absolute deviation

`ta.bb(source, length, mult)` - Bollinger Bands

`ta.keltner(source, high, low, close, length, mult)` - Keltner Channel

Squeeze momentum setup

Bollinger Bands example

Oscillators

Aggregators

​ta.atr(high, low, close, length) - Average True Range

​ta.stdev(source, length) - Standard deviation

​ta.variance(source, length) - Variance

​ta.dev(source, length) - Mean absolute deviation

​ta.bb(source, length, mult) - Bollinger Bands

​ta.keltner(source, high, low, close, length, mult) - Keltner Channel

​Squeeze momentum setup

​Related pages

Bollinger Bands example

Oscillators

Aggregators

`ta.atr(high, low, close, length)` - Average True Range

`ta.stdev(source, length)` - Standard deviation

`ta.variance(source, length)` - Variance

`ta.dev(source, length)` - Mean absolute deviation

`ta.bb(source, length, mult)` - Bollinger Bands

`ta.keltner(source, high, low, close, length, mult)` - Keltner Channel

Squeeze momentum setup

Related pages