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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > November  >
In the Laboratory
A Note on Covariance in Propagation of Uncertainty
Edwin F. Meyer
DePaul University, Chemistry Department, 1036 West Belden Avenue, Chicago, IL 60614-3214
Cover
November 1997
Vol. 74 No. 11
p. 1339
Abstract
It is pointed out that whenever both the slope and the intercept are used in calculating a physical quantity from a linear regression, propagation of error must include the covariance as well as the variances. The point is illustrated with a calculation of the boiling point of water from the parameters of the lnP vs 1/T fit. If the covariance is omitted from the propagation of error, the estimate of uncertainty is unreasonably large.
More Information
*  Citation
 Meyer, Edwin F. J. Chem. Educ. 1997 74 1339.
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*  History
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Last Updated:		 July 26, 1999
June 23, 2005
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