Which part of the GCHART procedure determines the analysis variable for calculations?

In the context of the GCHART procedure, the SUMVAR option is crucial as it explicitly specifies the variable that will be used for analysis calculations. This option indicates which numeric variable's values should be summarized in the chart. When generating a graphical representation, it is essential to define the analysis variable to ensure that the visual output accurately reflects the desired data aggregation.

By using the SUMVAR option, users can control which specific data points are summed or calculated, thus allowing for diverse analytical perspectives in the chart output. For example, if a dataset contains sales data for different products, the SUMVAR option might be employed to focus on total sales per product category.

Other options serve different purposes; for instance, the TYPE option determines the type of chart generated, the FILL option relates to how the chart areas are filled with color, and the EXPLODE option typically allows for segmenting slices in pie charts to emphasize certain sections. However, none of these other options define which analysis variable to calculate, emphasizing why the SUMVAR option is the correct choice here.