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arXiv 1010.5348math.PR
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具有平衡替换矩阵的瓮模型的强律

Strong Laws for Urn Models with Balanced Replacement Matrices

Amites Dasgupta, Krishanu Maulik

摘要:

我们考虑一个瓮模型,其替换矩阵的所有元素非负且是平衡的,即行和为常数。我们得到的率对应于每种颜色的球的计数强法律举行。分析需要分两步重新排列颜色。我们首先减少替换矩阵块上三角一个,其中对角块是不可约或标量零。然后,根据不可约对角块的Perron-Frobenius特征值,归纳地给出颜色计数的缩放。在重新排列的第二步中,颜色被进一步重新排列以将块上三角替换矩阵简化为标准形式。在更温和的技术条件下,我们得到了标度,并确定了极限。我们表明,限制随机变量对应的块内的颜色的计数是彼此的常数倍。我们也为它们提供了一个易于理解的显式公式。这里考虑的模型包含瓮模型与不可约的替换矩阵,以及,上三角和几个特定的块上三角的文献中考虑的,并给出了一个详尽的图片的颜色计数在一般情况下,只有可能的限制,替换矩阵是平衡的,并有非负的条目。

英文摘要:

We consider an urn model, whose replacement matrix has all entries nonnegative and is balanced, that is, has constant row sums. We obtain the rates of the counts of balls corresponding to each color for the strong laws to hold. The analysis requires a rearrangement of the colors in two steps. We first reduce the replacement matrix to a block upper triangular one, where the diagonal blocks are either irreducible or the scalar zero. The scalings for the color counts are then given inductively depending on the Perron-Frobenius eigenvalues of the irreducible diagonal blocks. In the second step of the rearrangement, the colors are further rearranged to reduce the block upper triangular replacement matrix to a canonical form. Under a further mild technical condition, we obtain the scalings and also identify the limits. We show that the limiting random variables corresponding to the counts of colors within a block are constant multiples of each other. We provide an easy-to-understand explicit formula for them as well. The model considered here contains the urn models with irreducible replacement matrix, as well as, the upper triangular one and several specific block upper triangular ones considered earlier in the literature and gives an exhaustive picture of the color counts in the general case with only possible restrictions that the replacement matrix is balanced and has nonnegative entries.

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