variance property

String? variance
getter/setter pair

The variance (for example, square of the standard deviation) of the metric value.

If value is exact, variance is 0. Can be used to calculate margin of error as a percentage of value, using the following formula, where Z is the standard constant that depends on the preferred size of the confidence interval (for example, for 90% confidence interval, use Z = 1.645): marginOfError = 100 * Z * sqrt(variance) / value

Implementation

core.String? variance;