Spatial autocorrelation statistics were used to examine the spatial structure of genetic variation. No significant pattern was detected, which suggested extensive pollen flow.

利用空间自相关分析检测上述四个种群的空间遗传结构，结果表明，四个种群中的成株均无显著的空间自相关。

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So, as you can see, the KIPP schools studied do show significant attrition, and the comparable public schools show no such pattern.

FORBES: The Continuing Success of KIPP Schools