---
metadata:
  - name: generator
    content: Diplodoc Platform v5.48.2
alternate:
  - https://yandex.com.tr/dev/metrika/en/stat/param.md
  - https://yandex.com.tr/dev/metrika/ru/stat/param.md
---
> **Documentation Index:** Fetch the complete configuration index at https://yandex.com.tr/dev/metrika/en/llms.txt

# Parametrization

The Reporting API supports parametrization of dimensions and metrics.

Parametrization is a mechanism for setting parameters for certain dimensions and metrics.

The parameters are defined in angle brackets `<>`. For example:

- To group sessions by time, the `ym:s:datePeriod<group>` dimension is parameterized by the `group` parameter.
- To get the number of converted sessions, the `ym:s:visits` metric is parameterized as follows: `ym:s:goal<goal_id>visits`.

The existing parameters are:

#|
|| **Parameter** | **Name** | **Description** | **Default value** ||
|| `goal_id` | Goal | ID of the goal. | ||
|| `group` | Dimension | Grouping by time period for certain dimensions.
Acceptable values: `day`, `week`, `month`, `quarter`, `year`. | `week` ||
|| `attribution` | Attribution model | Some dimensions let you set an [attribution model](https://yandex.com/support/metrica/reports/attribution-model.html).
Possible values:

- `first`: The first source.
- `last`: The last source.
- `lastsign`: The last significant source.
- `last_yandex_direct_click`: The last click from Yandex Direct.

The values that define [cross-device attribution](https://yandex.com/support/metrica/reports/attribution-model.html#cross-device) are also available:

- `cross_device_first`: The first source, including sessions from all the user's devices.
- `cross_device_last`: The last source, including sessions from all the user's devices.
- `cross_device_last_significant`: The last significant source, including sessions from all the user's devices.
- `cross_device_last_yandex_direct_click`: The last click from Yandex Direct, including sessions from all the user's devices.
- `automatic`: Automatic attribution. For more information, see [Help](https://yandex.com/support/metrica/reports/attribution-model.html#attribution-model__auto). | `lastsign` ||
|| `currency` | Currency | Some dimensions allow setting the currency.

Acceptable values: `RUB`, `USD`, `EUR`, `YND`. See also [ISO-4217](https://ru.wikipedia.org/wiki/ISO_4217). | `Depends on the tag settings` ||
|| `experiment_ab` | Experiment ID in Yandex Direct or Yandex Audience | In Yandex Audience, you can create experiments, and in Yandex Direct, you can set up campaigns based on your experiments. In Yandex.Metrica, you can track your experiment using the [Yandex.Direct, experiments](https://yandex.com/support/metrica/sources/direct-experiment.html) report. | — ||
|#

There are two ways to set a parameter in an expression:

- Set the parameter directly in the expression (for example, `ym:s:goal12345IsReached`) — this lets you set different parameter values for different expressions.
- Add the expression parameter to the request in its original form (for example, `...&dimensions=ym:s:goal<goal_id>IsReached&goal_id=12345&...`) — this lets you set a single parameter for all expressions.

You can use both of these methods in a request simultaneously.

See the example of [how parametrization of dimensions and metrics is used](https://yandex.com.tr/dev/metrika/en/stat/examples.md).