Hi all, I'm trying to calculate an estimate of population within a 1km distance of medical labs.
To do this I'm using a concentric ring buffer...however I have a couple of questions. 1- I created a 1km buffer first to see what it looked like and what population polygon centriods would fall into the area. Then using the concentric ring buffer I did the same thing, calculating the average for my population poylgon for those where centriods are found within. My problem is the concentric ring buffer is actually close to a 2km radius, not 1. I did enter it as 1, any ideas why this is happening? 2- Does anyone know what the difference between the "Average" and "Proportional Average" functions are and which would be a more accurate estimate? Thanks very much Christine
