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- Koken Ozaki, Hideki Toyoda, N. Iwama, Saori Kubo, Jyuko Ando
- Behavior genetics
- 2011

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)

- Hideaki Sakai, K. Orita, N. Iwama
- ICASSP
- 1982

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)

- N. Iwama, Hideki Toyoda
- Shinrigaku kenkyu : The Japanese journal of…
- 2011

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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