There are multiple ways to calculate a five number quantile summary. The current version of fivenum returns min, 1st quartile, median, 3rd quartile, max of the elements of the sequence. Different software generally have the same results for "min", "median", and "max", but there are different ways to get "first quartile" and "third quartile".
In particular, Tukey's hinge method includes median in the first/third quartile calculation, and is the method used in R's version of fivenum. Adding a keyword option for a Tukey computation in the fivenum function and implementing Tukey's version of first and third quartile would make working with R code a bit easier. There are many descriptions discussing Tukey's method, and this would make a good first issue.
There are multiple ways to calculate a five number quantile summary. The current version of
fivenumreturnsmin, 1st quartile, median, 3rd quartile, maxof the elements of the sequence. Different software generally have the same results for "min", "median", and "max", but there are different ways to get "first quartile" and "third quartile".In particular, Tukey's hinge method includes median in the first/third quartile calculation, and is the method used in
R's version offivenum. Adding a keyword option for a Tukey computation in thefivenumfunction and implementing Tukey's version of first and third quartile would make working with R code a bit easier. There are many descriptions discussing Tukey's method, and this would make a good first issue.