# Analysis of variables of varying numbers

I work with amino acid sequences and I want to use a self-made model to tell me something about it, lets call it $f(\text{seq})$. Now i want to know the contribution of every position in the sequence onto the model, i.e. my question is what is the importance/effect of amino acid $A$ occuring at position $I$ in the sequence with respect to the model?

How do I visualize something like that?

I want to use my model also on several sequences of differing lengths. Somehow this throws a monkeywrench into my plans of using a neural net...

My question is simple yet I did not find anything about it. Pointers would be appreciated. Or any comment you might have. This whole idea of mine is pretty unfinished and I don't really know yet what I want. So feel free to criticize, I will update the question accordingly.

Ah and if this is the wrong place to put this here please tell me also (:

cheers and thanks

note: this is a repost from th.stackexchange.

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