MUTUAL CORRELATION EFFECT OF STOCHASTIC TYPE BETWEEN TWO FACTORS AMONG SOUND, ILLUMINANCE AND ELLECTROMAGNETIC WAVES LEAKED FROM A VDT ENVIRONMENT

摘要

Up to now, many researches have been reported to the wave motion type (sound, light and electromagnetic wave) environment but many of them have been discussed in an individually separate form. For evaluating their effect in some mutual and/or a whole form, it is important to analyze at least stochastically their correlative effect between two factors among them. In this paper, a new method for finding minutely and hierarchically their mutual correlation information is proposed based on a generallized regression analysis applicable to non-Gaussian type random fluctuation. More concretely, first, the joint probability distribution of two-variate fluctuation factors is expressed in a statistical type Hermite series expansion form. By using this probability expression, to reflect various linear and/or nonlinear types of mutual correlation information between two random variables, a general expression of conditional probability distribution can be derived and then an extended regression function reflecting hierarchically not only the lower order correlation information but also the higher order mutual correlation information is concretely obtained. Moreover, by employing this conditional probability expression including the higher order correlation information, a whole probability distribution form of individually separated factors can be explicitly estimated each other. Finally, the proposed method has been confirmed by applying it to the sound, light and electromagnetic waves leaked from VDT under playing the game on a personal computer.