For 100blocks_07_11.shp
y07_11cnt = count of homicides and shootings in each census block in Oakland
block_num = The census block ID number
bufer_cnt = homicides and shooting joined to the 292 ft buffer of each census block 
block_cnt = homicides and shootings joined to each census block
y07_11flag = Each 100 block is given a 1 value to identify and other blocks are given a 0 value

For 100blocks_2011.shp
y11cnt = count of homicides and shootings in each census block in Oakland
cnt_sho = count of all shootings in each census block in Oakland
block_num = The census block ID number
bufer_cnt = homicides and shooting joined to the 292 ft buffer of each census block
y11flag = Each 100 block is given a 1 value to identify and other blocks are given a 0 value
block_cnt = homicides and shootings joined to each census block