I think that is a good choice as except for very high precision 
measurements the assumption is that the errors in the constants are 
uncorrelated.  In the case where the measurement/calculation is sensitive 
to the correlations the user should be carefully checking those 
correlations and would have to do a thorough review of the literature and 
probably recalculate the correlations to make sure they have things correct.

Jonathan

On Saturday, March 31, 2012 6:47:45 PM UTC-5, Eviatar wrote:
>
> Now that I look through 
> http://physics.nist.gov/cuu/Constants/RevModPhys_80_000633acc.pdf, I've 
> decided not to implement uncertainty (except as an attribute of the 
> constant object), since taking into account the correlation coefficient 
> between any two constants is more difficult than I thought (see 
> http://physics.nist.gov/cuu/Correlations/index.html and 
> http://physics.nist.gov/cuu/LSAData/index.html; apparently the covariance 
> matrix for 2006 and 2010 isn't even available). 

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