I wonder how many people had to read this correction twice, as I did:
A driver who texts while driving is six times as likely to be involved in a crash as a driver who doesn't text. A Business News article Saturday about driver-monitoring systems incorrectly said that a driver who texts is six times more likely to be involved in a crash than one who doesn’t.When I got it — the Wall Street Journal had written “six times more likely,” and now was “correcting” the wording to “six times as likely” — I knew it was meant for a small band of sticklers. These are the people who claim that “six times as likely” means “multiplied by six,” but “six times more likely” really — that is, properly, mathematically — means “multiplied by seven”: It’s the original amount plus six more servings.
But I don’t buy it. As Merriam-Webster’s Dictionary of English Usage says, “It is possible to misunderstand times more in this way, but it takes a good deal of effort.” In real life, nobody uses “six times more” to mean “seven times as much” (and if they did, how would a reader know it, without the numbers?). MWDEU concludes:
The fact is that “five times more” and “five times as much” are idiomatic phrases which have — and are understood to have — exactly the same meaning. The “ambiguity” of times more is imaginary.
The same argument is aimed at “six times less” to mean one-sixth — which, unlike “times more,” often does trigger my editorial antennae. I’d consider changing it in copy, if it were at all distracting. But I stopped worrying about it once I noticed that Mark Liberman of Language Log uses it unapologetically, even in contexts where he’s wrangling complicated statistics. If it’s OK with him, it’s OK with me.
Further reading:
Motivated Grammar defends “times less”: https://motivatedgrammar.wordpress.com/2008/11/10/five-times-dumber/
My Globe column on “times less”: http://archive.boston.com/news/globe/ideas/articles/2007/10/21/do_the_math
John McIntyre disagrees, gently: http://weblogs.baltimoresun.com/news/mcintyre/blog/2008/10/less_is_not_more.html
Bill Walsh disagrees, firmly: http://www.theslot.com/times.html
Arnold Zwicky treats “times more” and “times less” in a post on the Recency Illusion: http://languagelog.ldc.upenn.edu/nll/?p=463