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Background

Numerical accuracy of statistical software has been a concern for many years

Longley (1967), "An Appraisal of Least Squares Programs for the Electronic Computer from the Viewpoint of the User", JASA, 62, pp. 819841.

Wampler (1970), "A report on the accuracy of some widely used least squares computer programs", JASA, 65, pp. 549565.

Francis, Heiberger, and Velleman (1975) "Criteria and considerations in the evaluation of statistical program packages", American Statistician, 29, pp. 5255.

Gentle (1982) "Testing and evaluation of statistical software", Evaluating Mathematical Programming Techniques, pp. 248257.

Eddy and Cox (1991), "The quality of statistical software: Controversy in the statistical software industry", Chance, 4, pp. 1218.