Request Syntax URI Request Parameters Request Body Response Syntax Response Elements Errors See Also

GetExperimentResults

Important

End of support notice: On October 16, 2025, AWS will discontinue support for CloudWatch Evidently. After October 16, 2025, you will no longer be able to access the Evidently console or CloudWatch Evidently resources.

Retrieves the results of a running or completed experiment. No results are available until there have been 100 events for each variation and at least 10 minutes have passed since the start of the experiment. To increase the statistical power, Evidently performs an additional offline p-value analysis at the end of the experiment. Offline p-value analysis can detect statistical significance in some cases where the anytime p-values used during the experiment do not find statistical significance.

Experiment results are available up to 63 days after the start of the experiment. They are not available after that because of CloudWatch data retention policies.

Request Syntax


POST /projects/project/experiments/experiment/results HTTP/1.1
Content-type: application/json

{
   "baseStat": "string",
   "endTime": number,
   "metricNames": [ "string" ],
   "period": number,
   "reportNames": [ "string" ],
   "resultStats": [ "string" ],
   "startTime": number,
   "treatmentNames": [ "string" ]
}

URI Request Parameters

The request uses the following URI parameters.

experiment

The name of the experiment to retrieve the results of.

Length Constraints: Minimum length of 1. Maximum length of 127.

Pattern: ^[-a-zA-Z0-9._]*$

Required: Yes

project

The name or ARN of the project that contains the experiment that you want to see the results of.

Length Constraints: Minimum length of 0. Maximum length of 2048.

Pattern: (^[a-zA-Z0-9._-]*$)|(arn:[^:]*:[^:]*:[^:]*:[^:]*:project/[a-zA-Z0-9._-]*)

Required: Yes

Request Body

The request accepts the following data in JSON format.

baseStat

The statistic used to calculate experiment results. Currently the only valid value is mean, which uses the mean of the collected values as the statistic.

Type: String

Valid Values: Mean

Required: No

endTime

The date and time that the experiment ended, if it is completed. This must be no longer than 30 days after the experiment start time.

Type: Timestamp

Required: No

metricNames

The names of the experiment metrics that you want to see the results of.

Type: Array of strings

Array Members: Fixed number of 1 item.

Length Constraints: Minimum length of 1. Maximum length of 255.

Pattern: ^[\S]+$

Required: Yes

period

In seconds, the amount of time to aggregate results together.

Type: Long

Valid Range: Minimum value of 300. Maximum value of 90000.

Required: No

reportNames

The names of the report types that you want to see. Currently, BayesianInference is the only valid value.

Type: Array of strings

Array Members: Minimum number of 0 items. Maximum number of 5 items.

Valid Values: BayesianInference

Required: No

resultStats

The statistics that you want to see in the returned results.

PValue specifies to use p-values for the results. A p-value is used in hypothesis testing to measure how often you are willing to make a mistake in rejecting the null hypothesis. A general practice is to reject the null hypothesis and declare that the results are statistically significant when the p-value is less than 0.05.
ConfidenceInterval specifies a confidence interval for the results. The confidence interval represents the range of values for the chosen metric that is likely to contain the true difference between the baseStat of a variation and the baseline. Evidently returns the 95% confidence interval.
TreatmentEffect is the difference in the statistic specified by the baseStat parameter between each variation and the default variation.
BaseStat returns the statistical values collected for the metric for each variation. The statistic uses the same statistic specified in the baseStat parameter. Therefore, if baseStat is mean, this returns the mean of the values collected for each variation.

Type: Array of strings

Array Members: Minimum number of 0 items. Maximum number of 5 items.

Valid Values: BaseStat | TreatmentEffect | ConfidenceInterval | PValue

Required: No

startTime

The date and time that the experiment started.

Type: Timestamp

Required: No

treatmentNames

The names of the experiment treatments that you want to see the results for.

Type: Array of strings

Array Members: Minimum number of 1 item. Maximum number of 5 items.

Length Constraints: Minimum length of 1. Maximum length of 127.

Pattern: ^[-a-zA-Z0-9._]*$

Required: Yes

Response Syntax


HTTP/1.1 200
Content-type: application/json

{
   "details": "string",
   "reports": [ 
      { 
         "content": "string",
         "metricName": "string",
         "reportName": "string",
         "treatmentName": "string"
      }
   ],
   "resultsData": [ 
      { 
         "metricName": "string",
         "resultStat": "string",
         "treatmentName": "string",
         "values": [ number ]
      }
   ],
   "timestamps": [ number ]
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

details

If the experiment doesn't yet have enough events to provide valid results, this field is returned with the message Not enough events to generate results. If there are enough events to provide valid results, this field is not returned.

Type: String

reports

An array of structures that include the reports that you requested.

Type: Array of ExperimentReport objects

Array Members: Minimum number of 0 items. Maximum number of 1000 items.

resultsData

An array of structures that include experiment results including metric names and values.

Type: Array of ExperimentResultsData objects

Array Members: Minimum number of 0 items. Maximum number of 1000 items.

timestamps

The timestamps of each result returned.

Type: Array of timestamps

Array Members: Minimum number of 0 items. Maximum number of 100800 items.

Errors

For information about the errors that are common to all actions, see Common Errors.

AccessDeniedException

You do not have sufficient permissions to perform this action.

HTTP Status Code: 403

ConflictException

A resource was in an inconsistent state during an update or a deletion.

HTTP Status Code: 409

ResourceNotFoundException

The request references a resource that does not exist.

HTTP Status Code: 404

ThrottlingException

The request was denied because of request throttling. Retry the request.

HTTP Status Code: 429

ValidationException

The value of a parameter in the request caused an error.

HTTP Status Code: 400