Ezebuilo R. Ukwueze, Oliver E. Ogbonna, Ozoemena S. Nwodo,
& Chinasa E. Urama
Department of Economics, University of Nigeria, Nsukka, Nigeria.
Email: oliver.ogbonna@unn.edu.ng
'
...3.1
it it it
y X
𝜖𝑖𝑡 𝜂𝑖+ 𝜖𝑖𝑡 𝜂𝑖 𝜖𝑖𝑡
'
...3.2
it it it it
y X Z
χ
‐