Comps index values are calculated as aggregates. The comps set is treated as a single entity where the sum of all the comps comprises the financials. The metric for the index is then calculated as a whole.
Using an aggregate calculation is equivalent to using a weighted mean of the individual company metrics, weighted by the ratio denominator. For more on this approach, read this post about weighted averages on Fix The Pitch.
Having trouble? We’re here to help. Request a call back at (720) 336-5170 or email firstname.lastname@example.org to talk to one of our content and data specialists. We’ll help you create the content you need with the data you want.