ema

Exponential Moving Average

`ema(source, periods)`

Parameters

Name	Type	Description
`source`	field	Data series
`periods`	int	Number of periods

Formula

EMA = (value * multiplier) + (prev_EMA * (1 - multiplier)), multiplier = 2 / (periods + 1)

Examples

// price above 8-day EMA (short-term uptrend)
close > ema(close, 8);

// price below 21-day EMA (intermediate downtrend)
close < ema(close, 21);

// fast EMA crossed above slow EMA (golden cross)
crossover(ema(close, 12), ema(close, 26));

// price above 200-day EMA (long-term uptrend)
close > ema(close, 200);

Returns

float — may be NULL

Range

periods must be 2-210

Notes

Seeded with the SMA over the periods bars ending at the seed bar; the recursion starts there. No value before the seed bar (periods-1 rows past the source's own warm-up are NULL)

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