Some journals now require "author contribution" statements in papers. Should these statements also include a "percentage" contribution statement as well?
Thanks to Anna Malgorzata Kaminska for bringing up a similar topic in an earlier discussion
I concur with the preceding response. In some cases, quantifying contribution could be difficult and may incite some debate. I suggest you merely provide what tasks were performed by the participants.
If the journal ask you for that, you should. But I agree with the others, that setting a percentage for telling the contributor can lead to a debate of weather the content writing or the editing is more important or weather the discussion is more important than the results.