[R] Elasticity

[Giusy]

Hello,
I'm starting with data analysis with R, and I'd like to know if there is in
any package a function to have price elasticity of an item.
For example I have information about sale quantity and price, and I want to
know if the series is sensitive to the price.
Sale Quantity	Price
        34	                4$
        23	                4$
        46	                5$
        21	                5$
        46	                5$
        ...                  ...
So I have 2 time series..I think about correlation function, but I'm
wondering if there is a more specific function.
Thank you very much
Giusy
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