English language question....

[VJ]

Can I write this in English:

The structure is either determined beforehand or is decided on based on the available data.

It concerns the first on (in bold). Should it be there or not? The sentence is a shortened version to be able to ask the question; it is a sentence that belongs in a scientific article. It looks weird with the two on's in such a close succession, but there is a difference between "you decide on something" and "you decide something", so I think it should be there... Or should I just use a different verb?

Thanks!

[UtwigMU]

I'm not native but I'd write

is decided upon available data.

Wait till natives chime in.

[Umfriend]

Not exactly sure what you're looking for (if not based on data, then how?, before what?) but would:
"The structure is [will] either be determined beforehand or based on available data." or
"The structure is [will] either be determined beforehand or on the basis of available data."

If it needs to be as is, then I would consider replacing the first/bold on with "upon", makes it clearer it is a reference to the structure.

[KRSESQ]

You can say "The structure is either determined beforehand or based on available data."

I assume you're referring to a structure which can be assembled according to either a predetermined blueprint, or a blueprint which is in a state of flux due to the differing data sets. In which case just trimming the extra verbiage is fine. Unless you require extra specificity, in which case you need to specify what you're being specific about.

[Dilitante1]

I'd go with The structure is either determined beforehand or is decided upon, based on the available data.

[VJ]

Thanks!

I'll rewrite the text a bit, not sure which of the suggestions I'll use but thanks for the input!