import { aq, op } from '@uwdata/arquero'
= aq.loadCSV("palmer-penguins.csv")
penguins
.view() penguins
penguins.groupby('species')
.filter(d => d.body_mass_g > 0)
.rollup({
count: op.count(),
avg_mass: op.average('body_mass_g')
}).view()