# MetricValue

- [JSON representation](https://developers.google.com/authorized-buyers/apis/reference/rest/v2beta1/MetricValue#SCHEMA_REPRESENTATION)

A metric value, with an expected value and a variance; represents a count that may be either exact or estimated (for example, when sampled).

| JSON representation ||
|---|---|
| ``` { "value": string, "variance": string } ``` |

| Fields ||
|---|---|
| `value` | `string (https://developers.google.com/discovery/v1/type-format format)` The expected value of the metric. |
| `variance` | `string (https://developers.google.com/discovery/v1/type-format format)` 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 |