I want to calculate the percent change for median household income in Los Angeles at the block group level from 2000 to 2010. Someone told me I have to reaggregate 2000 block data to 2010 block group geography, do a spatial join based on centroid, and that I have to download "crosswalk" or relationship data from the U.S. Census comparing 2000 to 2010. I downloaded the relationship .txt file with 2000 California Census tabulation data and the 2010 tabulation data. Right now I have the unjoined data files. I don't know what to do next. What do I join together?
1) Can someone give me step-by-step instructions on how to calculate the percent change at the block group level? :/
2) If calculating it at the block group level is too complicated, I may just change my level of analysis to census tract level. How do I calculate the percent change at the census tract level?