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Understanding audiences isn’t one-size-fits-all. Our specialized data sets let you go deep on the audiences that matter most. For a complete list of our core offer of data sets, visit our Data Sets Overview page.

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What you need to know

There are three main things to keep in mind when working with multiple data sets via the Platform API: the data set namespace, data set compatibility, and how multiple data sets affect your taxonomy and question search responses.

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Referencing data set namespaces

Our data sets are organized into namespaces. Each namespace represents a distinct data set or survey module. If you have access to multiple data sets, your API calls will need to reference the data set namespace before the question code using the format namespace.question.  You can identify all the data sets available to you and their corresponding namespaces through: The same question code might correspond to different questions in different namespaces. For example, q4 is the code for the age group composition question in GWI Core, whereas in GWI Automotive q4 refers to the number of cars owned. If you want to check data on age composition within our Core data set, you’ll want to reference the Core namespace: core.q4. If you want to know about the number of cars owned using GWI Automotive data, the question should be referenced as: gwi-automotive.q4 You may find that GWI Core questions can sometimes be referenced without the namespace, however we always recommend using the fully qualified format (namespace.question) to avoid confusion.

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Combining data from different data sets

We offer two types of data sets: primary data sets and add-on data sets. Our primary data sets are GWI Core, GWI USA, and GWI Kids. These are based on data collected through independent surveys administered to separate samples of respondents.  Our add-on data sets complement our flagship data set GWI Core with additional topics across select markets. This means you can use add-on questions alongside Core ones in the same analysis, letting you combine the depth of our add-on offering with the breadth of GWI Core. When combining questions from GWI Core and any add-on, you may notice a smaller sample size as the analysis will include only the respondents who completed both the Core survey and the relevant add-on, which will be a subset of the full Core sample. In some cases, highly specific cross-study combinations may return low or no respondent counts. Note that add-ons can only be combined with GWI Core, not with each other or with the other primary data sets (GWI USA and GWI Kids), as these are all based on separate respondent samples.

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Larger taxonomy and question search responses

When working with multiple data sets, the overall structure of responses remains unchanged, but if additional studies have become available through your subscription you may see a significantly larger output when searching for questions. If you’ve recently been given access to additional data sets, we recommend re-calling the Taxonomy endpoint and refreshing your cached taxonomy to store the expanded data set catalog. See instructions here for more detail. If you want to focus on a specific data set when searching for questions, you can filter results using the namespace_code field.