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I would like to express my sentence using is +verb+ing however, I feel the grammar is wrong.

The one main advantagae of using model A is allowing specifying different marginal distribution for each variable

I feel that the grammar is worng for allowing specifying

Is my sentence correct? if not, then how can I edit it?

Thank you so much for your help.

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  • The one main advantage of using model A is that it allows the specification of different marginal distributions for each variable. Note that you need to use a plural specifications.
    – Jason Bassford
    Dec 12, 2018 at 12:03

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I don't think consecutive -ing verbs are ungrammatical - but they definitely sound jarring to a native speaker.

I find that the -ing and to-forms can often be used interchangeably. With something like your example, I look for which of the two -ing verbs is showing intention, and which shows consequence. I then use the to-form to show the intention.

So, for your example, this is one option I would consider:

The one main advantage of using model A is to allow the specifying of different marginal distribution for each variable.

While that method will work in most situations, it is not always best. You could use "it allows" instead of "to allow". Another option is "specification" instead of "specifying".

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