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Rabe-Hesketh, Sophia and Everitt, Brian (2007) A handbook of statistical analyses using Stata. 4th edition. Chapman and Hall/CRC, Boca Raton, FL; London. ISBN 1584887567
Everitt, Brian and Rabe-Hesketh, Sophia (2001) Analyzing medical data using S-PLUS. Springer, New York. ISBN 9780387988627