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What are the factors that affect the inherent effectiveness of educational experiments?
The factors that affect the intrinsic effectiveness of educational experiments are:

Contingency, maturity, test migration, statistical regression, sample selection deviation, test error, missing subjects, and the interaction between sample selection and maturity.

Educational experiment method is a method for researchers to control and manipulate some educational factors or conditions purposefully by using the principles and methods of scientific experiments and under the guidance of certain educational theories and assumptions, and to reveal the laws of educational activities by observing the changes of educational factors or educational phenomena accompanying the controlled conditions.