European Scientific Journal
April edition vol. 8, No.7
ISSN: 1857 – 7881 (Print)
e -
ISSN 1857- 7431
8
are unbiased and efficient, since they avoid the problems that may arise in the presence of
serial correlation and endogeneity (Siddiki, 2000; Siddiki, 2002, Almasaied, 2007).
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