The same options available on the time series are available for the statistics widget:
Statistic widget total for time period (left) vs Timeseries (right)
The predictions count below shows the configuration and aggregation options for a statistic widget:
Configuration for Statistic Widget
The same evaluation metrics available in the timeseries plots are available in statistic widgets. Here's an example showing a statistic widget on the left representing the accuracy for the entire time period.
Statistic Widget Total for time period (right) vs Timeseries By Day (left)
The statistic widget will have different configuration options based on the selection of an evaluation metric.
Statistic Widget Confgiuration
When you select Validation or Training the data displayed is based on the date of the batch not the production date range selector. This allows teams to compare a batch of data from training to any time of production.
In the picture above the fixed date the data was sent is shown below the environment selection.