Computing multiple stats
Let's now combine everything from the past two exercises to find multiple summary statistic with multiple groups in batrips.
Cet exercice fait partie du cours
Data Manipulation with data.table in R
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
# Compute mean of duration and total trips grouped by start and end stations
aggregate_mean_trips <- batrips[, ___, ___]
aggregate_mean_trips