Trends in Agricultural Economics1994-79332077-2246Asian Network for Scientific Information10.3923/tae.2009.17.27NmaduJ.N.YisaE.S.MohammedU.S.1200921The possibility of the type of spline function and joint
points selected affecting the consistency of the ex-post and ex-ante forecasts
were tested using cereal production (1961-2006) and percent contribution
of agriculture to GDP (1961-2004) in Nigeria. Three types of model, that
is, Linear-Quadratic-Linear, Quadratic-Quadratic-Linear and Linear-Quadratic-Quadratic,
were used. The result indicated that there is no universality as to which
model is appropriate, rather all possible models should be tried and the
one that gives most consistent result when compared to observed data and
other factors should be used.]]>Bormann, J., G.R. Wiggans, T. Druet and N. Gengler,2002EarthTrend,2006Fox, K.J. and R.Q. Grafton,2000Fuller, W.A.,1969Marsh, L.С.,1986Meyer, K.,2005Nmadu, J.N. and D.O.A. Phillip,2001Nmadu, J.N. and T.T. Amos,2002Nmadu, J.N., J.O. Olukosi, T.T. Amos and R.S. Musa,2004Parsons, I.T. and R. Hunt,1981Phillip, D.O.A.,1990Rahman, S.A. and M.A. Damisa,1999Pierre, N.R., C.S. Thraen and W.R. Harvey,1987