Update phase/compute.py

phase/compute.py

@@ -30,7 +30,7 @@ class ParticipationAdoptionIndex:
         
         # absolute counts
         spi_a_abs = self.target_population - self.num_participants
-        spi_b_abs = self.target_population - spi_a_abs - self.feedback_volume
+        spi_b_abs = self.num_participants - self.feedback_volume
 
         # ----- 'Participation Dynamics' components -----
         pcr = self.num_participants / self.target_population