The paper proposed a space vector modulation strategy based on three-terminal output topo-(logy) of three-phase to two-phase matrix converter which uses indirect transform technology and the matrix converter is considered as a combination of a virtual rectifier and a virtual inverter.

Evaluating relatively stable points by dividing-into-group regression based on dummy variables;

The daily power consumption was sectionized according to its characteristics of value changing with time and temperature and corresponding dummy variables were imported.

The intercept and slope of dummy variable model do not remain constant ,but the variant of parameter is discrete but not continuous.

Software subdivision and "virtual frequency conversion" technology were adopted in this solution,which realized multigrade,adaptive subdivided drive in operation of stepping motor.

Application of dummy variables in electric consumption forecasting;

The Application of Dummy Variables to the Linear Regression Model;

By the use of dummy variables,a practical solution to the lack of fitting of regression is given in this essay.

In this paper, the concept of virtual variation is put forward and its basic principle is present.

In the regression analysis,classification variables must be converted to virtual variables.

This paper introduces the basic principle of a forecast model of the virtual variables,and illustrates the process of selecting the model variables.