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# Schema | Field Name | Description | Data Type | Format/ Example | Null value allowed? | | --- | --- | --- | --- | --- | | `experiment_id` | Anonymised ID for the A/B test | string | “036afc” | No | | `variant_id` | The ID of the treatment group. The summary statistics for the corresponding control group is included in Columns 5-7, and hence there are no dedicated rows for the control groups in this dataset. <br /><br /> Note: The variants are not necessarily numbered consecutively. | integer | 2 | No | | `metric_id` | The ID of the organisational metric. (See notes below on list of metric) | integer | (1 \| 2 \| 3 \| 4) | No | | `time_since_start` | Number of days since the start of the experiment. | double | 12.5 | No | | `count_c` | Number of samples in the control group. (The number is stored as a double, but they are clearly integers) | double | 123456.0 | No | | `mean_c` | The sample mean of responses across the control group. | double | 4.361 | Yes | | `variance_c` | The sample variance of responses across the control group. | double | 72.354 | Yes | | `count_t` | Number of samples in the treatment group. | double | 123572.0 | Yes | | `mean_t` | The sample mean of responses across the treatment group. | double | 4.345 | Yes | | `variance_t` | The sample variance of responses across the treatment group. | double | 73.591 | Yes | ## List of metrics The dataset features four metrics, numbered 1, 2, 3, and 4. Metric 1 accepts binary responses, metrics 2 and 3 accept count-based responses, and metric 4 accepts non-negative real number responses. The responses for metrics 2, 3, and 4 demonstrate various degrees of right skewness.