Using Views to categorize results

Conditional views (https://www.drupal.org/project/views_conditional) that have stable versions for D7 and D8 will do this.

IF / ELSE is evident when using this module. To achieve what I wanted, I created two conditional fields:

Views: Conditional views (if field_number is less than 100, low output, otherwise, moderate output)

Y

Views: Conditional views (if field_number is greater than 1000, large output, or output) [views_conditional] )

Then exclude the first conditional field from the screen.