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This doesn't read well and I'm not sure if this is correct:

Shipping fees can reduce the number of items a customer purchases, and they can decrease the frequency a customer makes purchases from the site.

What is the correct way to use the word frequency in this context?

The reason it "feels" like it doesn't read well is it seems like there should be something linking "frequency" and "a customer". However I do not know the rules of grammar well enough to know if there is a rule about this for this type of usage or how one would define the rule.

Update: the accepted answer introduced the concept of an "adverbial phrase" which is what I "felt" was missing but didn't know how to articulate.

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2 Answers 2

up vote 3 down vote accepted

Frequency is a noun, and you want to modify the verb phrase makes purchases, so you want an adverbial phrase or clause. We can provide this with at which or with which:

...they can decrease the frequency with which a customer makes purchases from the site.

We could also replace it the related adverb frequently

...they can decrease how frequently a customer makes purchases from the site.

There are other variations, but these are the two that make the least change to the original.

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Thank you for your answer, both suggestions read well and your explanation made sense. –  Charles Wesley Feb 20 '13 at 19:20
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That first alternative still sounds pretty weird to me. I much prefer @Trish's the frequency with which a customer makes purchases. –  FumbleFingers Feb 20 '13 at 19:34
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@FumbleFingers I agree. While I mentioned both, I think my plumbing for "at which" was from the thought that I'd prefer "rate at which" overall. "Frequency at which" I'd still think correct, but I'm changing to the nicer sounding with. –  Jon Hanna Feb 20 '13 at 19:40
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Although I do not have a specific explanation, I think that this sentence flows better:

Shipping fees can reduce the number of items a customer purchases, and they can decrease the frequency with which a customer makes purchases from the site.

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should that be "with which"? - rather hesitant about being a grammar-nazi on ELU! –  mgb Feb 20 '13 at 19:08
    
It's possible; I've seen a lot of variations: frequency that, frequency of which, frequency with which, frequency in which. If I replaced "frequency" with "amount of times", I would use "that". I'll edit my response to use "with which" though. –  Trish Rempel Feb 20 '13 at 19:29
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