[R] Selection of cities sample

[Matej Cepl]

 Hi,

I have a question, how to most properly select set of cities 
which would be as similar as possible in some particular 
variables with the City of Boston (which I use as my base line). 
I thought about ordering cities by sum of ((differences between 
value of that particular variable for that particular city and 
the value of same variable for Boston) divided by the standard 
deviation of the variable and multiplied by the weight 
(expressing how much that particular variable is important for 
me, or how much I want to avoid cities with this 
characteristic)). Is it sound method?

Or I am creating something which is already available in R as a 
standard function (which I suspect)?

	Thanks,

		Matej

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Matej Cepl, http://www.ceplovi.cz/matej
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