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Dyfyniad Arddull ChicagoSheather, Simon J. A Modern Approach to Regression with R. New York: Springer, 2009.
Dyfyniad MLASheather, Simon J. A Modern Approach to Regression with R. Springer, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.