In this section, we will compare code side by side to solve the same problem using both default R and `plyr`

. Reusing the `iris3`

data, we are now interested in producing five number summary statistics for each variable group by species. The five numbers will be minimum, mean, median, maximum, and standard deviation. The output will be a list of data frames.

To calculate the summaries for the five numbers, follow these steps:

- Define a function that will calculate five number summary statistics for a given vector.
- Produce the output of this function in a data frame object.
- Apply this function in the
`iris3`

dataset using a`for`

loop. - Apply the same function using the
`apply()`

function of the`plyr`

package.

An example that explains ...

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