mutate() dplyr verb
So far we’ve just filtered selected and re-arranged existing data. Now we’re going to look at creating new data.
Mutate lets us add variables (columns) to our data. These are usually derived from existing columns.
Add new variable (column) for log volume with
Here we use mutate to add a column called
logvolume to our data. It is calculated as the log of the
mutate(logvolume = log(volume))
Add new variable (column) for intraday returns with
In this example, we add a column for the intraday (open to close) simple returns of the stock each day.
mutate(intradayreturns = close / open – 1)
Stay tuned for the next installment in which the author will demonstrate the
summarise() dplyr verb
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