Spanish to English Bus/Financial Mathematics & Statistics

Hi guys,

These terms (I assume the first should be "ponderación") are referring to the importance given to three different variables in a table.

It's part of a project submitted for approval by a steering committee, and the steering committee isn't sure of how the three values have been used to determine which region will be considered a priority (the three value relate to armed conflict in Colombia).

The full sentence is:

¿cuál es el criterio de selección entre las tres variables? ¿se hace por medio de una ponderan o suma?

Any help would be greatly appreciated!

Thanks,
Nick