=+x6 5 ideology (4 5 conservative, 3 5 right of center, 2 5 middle of the road, 1 5 left of center, and 0 5 liberal)

x7 5 social class (4 5 upper, 3 5 upper middle, 2 5 middle, 1 5 lower middle, 0 5 lower)

x8 5 postmaterialist (1 if postmaterialist, 0 otherwise)

x9 5 materialist (1 if materialist, 0 otherwise)