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One of the biggest problems in classical twin studies is that it cannot estimate additive genetic (A), non-additive genetic (D), shared environmental (C), and non-shared environmental (E) effects, simultaneously, because the model, referred to as the ACDE model, has negative degrees of freedom when using Structural Equation Modeling (SEM). Therefore,(More)
This paper presents two methods for AR spectrum analysis based on a noisy autocovariance sequence. Unlike most of the traditional spectrum analysis methods, we assume that there is an observed autocovariance sequence, possibly with errors. Such a situation occurs in the Fourier spectroscopy. We fit AR models to this autocovariance sequence by two methods.(More)
It is difficult to estimate and examine correlations between individual preferences for alternatives using the present Scheffé-type paired comparison models. In this paper, we propose two models that address individual preferences for alternatives. One is a simple model that makes it possible to estimate correlations between individual preferences. The(More)
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