The nonparametric MNR method is used for stability test to ensure the reliability of the following conclusions by the analysis made,and a cross-section regression model is developed to discuss empirically the main influencing factors on the operating performances of those public com.

Application of cultivars stability parameter and high stable coefficient in the analysis of sugarcane regional trial in Yunnan;

The expression of stability parameter H is developed based on the stream function and axial velocity function of Newton helical flow in eccentric annuli with the inner and outer cylinders rotating simultaneously in this paper.

Using the method that is stability parameter,high stability coefficient,average of yield,coefficient of variation and coefficient of regression judged productivity and stability of 17 new maize varieties in Henan Maize Regional Trail in 2003.

But parametric stability test shows that,among the eight consumption expenditure equations that comprise a whole demand system,only the equations for clothing,household facilities and services,transportations and communications,miscellaneous commodities and services,as well as cultural,educational and recreational articles and services have witnessed a local and temporary structural change.