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All published error coefficients for estimating quadrature errors for analytic functions were computed on the assumption that the quadrature rule was exact for polynomials up to a given degree. Since these rules use rounded values for the abscissas and weights and since the true values of the integrals of some of the polynomials in question have an infinite binary expansion, the quadrature rule is not exact. Hence these errors must be taken into consideration in computing practical error coefficients.

Numerical Analysis: Practical error coefficients for estimating quadrature errors for analytic functions