PCTBLK = the portion of geocoded registered voters in the overlapping area of a given census block and sr precinct. PCTBLK is calculated as BLKREG (the total registered voters in an overlapping area of a census block and sr precinct) divided by the total registered voters in a block:
BLKTOTREG. BLKREG/BLKTOTREG = PCTBLK
PCTSRPREC = the portion of a sr precincts total registered voters that are in a given census block: BLKREG/SRTOTREG= PCTSRPREC
