Computing multiple stats
Let's now combine everything from the past two exercises to find multiple summary statistic with multiple groups in batrips.
Latihan ini adalah bagian dari kursus
Data Manipulation with data.table in R
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
# Compute mean of duration and total trips grouped by start and end stations
aggregate_mean_trips <- batrips[, ___, ___]
aggregate_mean_trips