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I posted this yesterday to r-help and Ben Bolker suggested reposting it here... Dickison, Daniel <ddickison <at> carnegielearning.com> writes: > > The documentation for agrep says it uses the Levenshtein edit distance, > but it seems to get this wrong in certain cases when there is a > combination of deletions and substitutions. For example: > > > agrep("abcd", "abcxyz", max.di...

...rwin9.8.0/x86_64 (64-bit) locale: [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base loaded via a namespace (and not attached): [1] tools_2.12.0 Daniel Dickison Research Programmer ddickison at carnegielearning.com Toll Free: (888) 851-7094 x103 FAX: (412) 690-2444 Revolutionary Math Curricula. Revolutionary Results. Carnegie Learning, Inc. | 437 Grant St. 20th Floor | Pittsburgh, PA 15219 www.carnegielearning.com

The documentation for `aggregate` makes it sound like aggregate.formula should behave identically to aggregate.data.frame (apart from the way the parameters are passed). But it looks like aggregate.formula is quietly removing rows where any of the "output" variables (those on the LHS of the formula) are NA. This differs from how aggregate.data.frame works. Is this expected behavior?