This represents a histogram that illustrates response data for a particular response type (e.g., opens or clicks).
- campaign_id [xsd:int]
- The ID of the campaign whose stats are being reported.
- response_type [xsd:string]
- The response type that this histogram pertains to.
- response_data [vrtypens:Histogram]
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An array of HistogramBin objects. Each HistogramBin contains a category and a count for that category.
The categories are determined by the response time window and number of bins requested.