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  3. Data Manipulation with data.table in R
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अभ्यास

Computing stats by groups (I)

So far you have worked with the two dimensions, rows and columns of a data.table. It's now time to consider the virtual third dimension by dividing rows into groups to calculate statistics.

निर्देश

100 XP

Compute the mean duration for every start_station, calling the aggregated column mean_duration.