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Dyfyniad Arddull ChicagoLittle, Roderick J.A, and Donald B. Rubin. Statistical Analysis with Missing Data/2nd Ed. 2nd ed. New Jersey: John Wiley & Sons, 2002.
Dyfyniad MLALittle, Roderick J.A, and Donald B. Rubin. Statistical Analysis with Missing Data/2nd Ed. 2nd ed. John Wiley & Sons, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.