Analysis and test of data’s accidental errors and systematic errors in marketing research;

This paper discusses the method of making accidental error by Montcaro.

Because of fault in operation and the precision of instrument,the defect error and accidental error are involved in the procession of data collection,the defect error that are brought by mistakes of people and influence of outside is large,the contingency error that are inevitably and randomicity is little.

By comparing the probability of the actual position within various random error patterns with the same arca, the paper inverses the various dimensions of each random error pattern with the same probability, and thus puts forward the considerations of using the random error patterns to judge the accuracy of the ship s position.

OBJECTIVE:To study the random error and its clinical application in analyzing intensity modulated radiation therapy (IMRT).

The paper analyses the teaching of Engineering Survey,describes the basic concepts of error including the definitions of accident error and closure,and finally provides examples for teaching.