This allows for the creation of a feature layer in your online or Portal organization with accompanying metadata that describes how to statistically apportion or calculate data. These layers or "statistical data collections" can then be used with the enrich method and in workflows within the BA web app such as Color Coded Maps and comparison reports. Custom reports can also be built using your own variables from these layers.
When calling the REST API, an enrich request uses the analysisVariables parameter to specify the portal itemid and individual variables: