counties = {
const names = []
const lats = d3.rollup(ca, d => d3.sum(d, d => d.y * d.pop) / d3.sum(d, d => d.pop), d => d.COUNTYFP)
for (let fip of fips) {
const code = +fip.fips.slice(2, 5)
const {name} = fip
names.push({
name,
code,
COUNTYFP: code,
y: lats.get(code)
})
}
return names
}