Computing multiple stats
Let's now combine everything from the past two exercises to find multiple summary statistic with multiple groups in batrips.
Este exercício faz parte do curso
Data Manipulation with data.table in R
Exercício interativo prático
Experimente este exercício completando este código de exemplo.
# Compute mean of duration and total trips grouped by start and end stations
aggregate_mean_trips <- batrips[, ___, ___]
aggregate_mean_trips