Construct a live stat from any StatSpec, dispatching on its modality. Useful for code paths (like StatSchemaDef.materialize) that iterate over an erased Map<String, StatSpec> and don't statically know the modality.

sample

fun <R : Result> DiscreteStatSpec<R>.sample(rate: Double, seed: Long): DiscreteStatSpec<R>

Wrap this discrete spec to keep each update with probability rate; seed feeds the PRNG.

throttle

fun <R : Result> DiscreteStatSpec<R>.throttle(every: Int): DiscreteStatSpec<R>

Wrap this discrete spec so it only sees one in every every updates.

transform

fun <R : Result> DiscreteStatSpec<R>.transform(expr: ScalarExpr): DiscreteStatSpec<R>

Wrap this discrete spec to apply expr to every update before the inner stat sees it.

weightBy

fun <R : Result> DiscreteStatSpec<R>.weightBy(expr: ScalarExpr): DiscreteStatSpec<R>

Wrap this discrete spec so every update's weight is multiplied by expr.eval(value.toDouble()).

windowed

fun <R : Result> DiscreteStatSpec<R>.windowed(durationMillis: Long, slices: Int = 10): DiscreteStatSpec<R>

Wrap this discrete spec in a sliding time window of durationMillis split into slices buckets.

withValue

fun <R : Result> DiscreteStatSpec<R>.withValue(value: Long): DiscreteStatSpec<R>

Wrap this discrete spec so every update pushes the constant value regardless of input.

withWeight

fun <R : Result> DiscreteStatSpec<R>.withWeight(weight: Double): DiscreteStatSpec<R>

Wrap this discrete spec so every update applies the per-observation weight multiplier.

HyperLogLog

constructor(precision: Int = 14, hasher: HasherRef = HasherRef.SplitMix64)(source)

hasher

val hasher: HasherRef(source)

HasherRef for the mixer applied before bucketing; resolved via the Hashers registry.

precision

val precision: Int(source)

Number of register-index bits; memory is 2^precision bytes.