This new method reduces the computational complexity by using the block tridiagonal structure of the input sample correlation matrix, and at the same time keeps the property of fast convergence.
在保持了该算法快速收敛优点的同时，利用相关矩阵块三对角的特殊结构，降低了该算法的计算复杂度。
In this sample, the correlation is defined for the message.
在这个样例中，针对该消息定义相关集。
When the sample size is great, QIF approach shows that the selection of working correlation is same to the selection of unbiased estimating equation.
当样本量较大时，QIF方法表明工作相关阵的选择等价于无偏估计方程的选择。
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