Using the Lieth model,this paper calculated the climate productive potential value of Xinyang city,analyzed the monthly and yearly change of temperature and precipitation and their influence to the crops production,discussed how to fully utilize the climate resources to reach higher production efficiency and then to increase crops output.

Based on singular value decomposition(SVD) and recursive generalized extended least squares(RGELS),a new recursive algorithm of parameter estimation for Box-Jenkins model is proposed.

Based on BOX-Jenkins model and exponential smoothing method,this paper attempts to establish the model of time series of Sichuan per capita GDP and analyze the short-term forecasting,implying that the goal of Sichuan province to realize the economic increase in eleventh five-year plan could be achieved on condition that the slower speed of economic increase will be ca.

Comparisons of bias compensation methods and other identification approaches for Box-Jenkins models;