A couple of days ago, I heard an interesting talk by Juliet Stanton, who proposed that variation in stress on the -at- in (English) words in -ative depends in a gradient way on the total duration of stressless material between -at- and the word's earlier main stress. Thus -at- stressing should (and does) become more frequent through a series like palliative, speculative, investigative, legislative.
It occurred to me to wonder whether there might be an effect in the other direction as well. That is, in a word like administrative (where dictionaries and my intuition agree that /ədˈmɪnᵻstrətɪv/ and /ədˈmɪnəˌstreɪdɪv/ are both possible), perhaps the phonetic duration of the intervening sequence would vary according to Stanton's principle.
I chose administrative for a test because a quick check of the LDC's published collection of conversational telephone speech turned up more than 70 instances of that word. But the OED turns out to be right that the version with stressed -at- predominates in the U.S. — 70 out of 73 instances in this set. And there were some other kinds of pronunciation variation — reductions — that make my idea hard to test in any case.
However, those reductions themselves are worth a look.
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