الفهرس 
The most common value of an attribute[6Only 14 pages are availabe for public view
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Abstract
My sincere appreciation and deep gratitude should be expressed to Dr. Tamer Medhat, lecturer in the Faculty of Engineering, Kafrelsheikh University, for his generous assistance, witty observations, and constructive criticisms. Dr. Tamer has been a constant vital source of elegant ideas and solutions. He has drawn my attention to numerous scientific references that have helped me recognize rough set threory and missing value. Without his kind help it would not be easy to bring this research to a successful end.