standardUncertainty property

@override Quantity get standardUncertainty

Returns the standard uncertainty in this Quantity object's value as a typed Quantity object.

Standard uncertainty is defined as the uncertainty (of a measurement result) by an estimated standard deviation, which is equal to the positive square root of the estimated variance. One standard deviate in a Normal distribution corresponds to a coverage factor of 1 (k=1) and a confidence of approximately 68%.

Implementation

@override
Quantity get standardUncertainty => snapshot.standardUncertainty;

set standardUncertainty (Quantity su)

Sets the relative standard uncertainty in this Quantity object's value to su.

• Will throw an ImmutableQuantityException (a RuntimeException) if this Quantity is in an immutable state.
• Relative standard uncertainty is defined as the standard uncertainty divided by the absolute value of the quantity. Standard uncertainty, in turn, is defined as the uncertainty (of a measurement result) by an estimated standard deviation, which is equal to the positive square root of the estimated variance. One standard deviate in a Normal distribution corresponds to a coverage factor of 1 (k=1) and a confidence of approximately 68%.

Implementation

set standardUncertainty(Quantity su) {
  if (!mutable) throw ImmutableQuantityException(q: this);
  if (!(dimensions == su.dimensions)) {
    throw DimensionsException(
        'The standard uncertainty must have the same dimensions as this Quantity object');
  }

  // Determine ur.
  final ratio = su / this; // Scalar
  _ur = ratio.mks.toDouble();
  _onChange.add(snapshot);
}