So I have 500 different store locations
125 locations are from w brand
200 are from xbrand
100 are from y brand
75 are from z brand

each store location released surveys in 2009 and in 2010
so for each year, i have how many surveys each location release, how may surveys were completed, and the overall response rate for each location

in what way can i use the avg rate of response for all different locations in 2009 to predict the response rate for the locations in 2010?

regress response rate 2010 (dep var), response rate 2009 (ind var), average response rate for all locations in 2009 (control variable)