Compute Minimum (computeMinimum)
The Compute Minimum property specifies whether the minimum value should be computed for a dimension.
Considerations regarding chart
                drawing and output sorting: When selecting a chart visualization (specified by Draw
                        As) that displays aggregated values, aggregation must be
                performed on the dimensions required by the chart. Similarly, output sorting
                requires an aggregation function to be defined for all dimensions by which these are
                sorted. If more then one aggregation option is selected, the processor picks the
                aggregate option that is highest in the priority list:
        Type: Boolean.
Default value: FALSE.
You can find the Compute Minimum property in the Value category of the Properties view.