The applications of the multiple regression technique in the prediction of
supply quantity have been addressed in various research studies; for example,
Gala et al. (2003) applied this technique to predict the supply quantity of olive in
Spain by taking into consideration related environmental factors and found that
the amount of pollen was an important factor in predicting the supply quantity
of olive. Qian et al. (2008) also applied the multiple regression technique for
forecasting the supply quantity from wheat production in Canada, and the results
showed that the forecasting model that was based on the multiple regression
technique gave the forecasting variance as 8-10%, when compared with the mean
forecasting values