Overview

After launching your experiment, Datadog immediately begins calculating results for your selected metrics. You can add additional metrics at any time, organize metrics into groups, and explore related user sessions to understand the impact of each variant.

Confidence intervals

For each metric, Datadog shows the average per-subject value (typically per user) for both the control and treatment variants. It also reports the relative lift and the associated confidence interval.

The relative lift is defined as:

                      (Average metric value per treatment subject - Average metric value per control subject)
 Relative lift =   -----------------------------------------------------------------------------------------------             
                                       (Average metric value per control subject)

The confidence interval represents the range of lift values that are plausibly supported by the experiment’s data. While the true lift could fall outside this range, values inside the interval are statistically more consistent with the observed data.

If the entire confidence interval is above zero, then the result is statistically significant. This suggests that the observed difference in metrics is unlikely to be attributable to random noise, and supports the conclusion that the experiment produced a true effect.

Exploring results

To dive deeper into experiment results, hover over a metric and click Chart. This gives you the option to compare the experiment’s impact across different user segments.

Segment-level results

Subject level properties are based on attributes at the initial time of exposure (for example, region, new vistor vs repeat visitor etc.). This is useful for understanding when certain cohorts of users reacted differently to the new experience.

Further reading

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