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Максимально правдоподобная оценка дисперсионно-ковариационной матрицы

Максимально правдоподобная оценка дисперсионно-ковариационной матрицы

Abstract

В работе сформировано аналитическое выражение, определяющее максимально правдоподобную оценку дисперсионно-ковариационной матрицы наблюдения вектора случайных величин, распределенных по многомерному нормальному закону. Решение основано на получении выражения, определяющего точку экстремума сформированной на основе распределения Уишарта функции правдоподобия. Полученная оценка дисперсионно-ковариационной матрицы позволяет повысить эффективность оценки с точки зрения снижения разброса дисперсии ошибки. Что по существу приводит к увеличению точности оценки дисперсионно-ковариационной матрицы (на величину порядка нескольких тысяч раз) уже на выборках малого объема независимо от разрядности дисперсионно-ковариационной матрицы (размера вектора случайных величин). Причем вычислительные затраты сформированной оценки не хуже существующих. Представлены результаты экспериментальной проверки сформированного аналитического выражения максимально правдоподобной оценки дисперсионно-ковариационной матрицы.

The work formed the analytic expression that defines the maximum likelihood estimate of variance-covariance matrix of the observation vector of random variables distributed according to multivariate normal distribution. The solution is based on obtaining an expression that identifies the extremum point formed on the basis of the distribution of Wishart likelihood function. The obtained estimate variance-covariance matrix to enhance the evaluation, in terms of reducing the spread of error variance. That substantially increases the accuracy of the estimate variance-covariance matrix (on the order of several thousand) already on the small sample size, regardless of the bit variance-covariance matrix (size of the vector of random variables). Moreover, the computational cost estimates formed better than the existing ones. The results of the experimental verification of the analytical expressions generated maximum likelihood estimation variance-covariance matrix.

Keywords

ДИСПЕРСИОННО-КОВАРИАЦИОННАЯ МАТРИЦА, РАСПРЕДЕЛЕНИЕ УИШАРТА, МАКСИМАЛЬНО ПРАВДОПОДОБНАЯ ОЦЕНКА

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold