【锚点】这一篇只钉一个判断:教育学里最著名的数字——「一对一辅导能提升 2 个标准差」——不是被推翻的,是【从来没被测出来过】。它是 Bloom 1984 从几个研究的分组均值里外推出来的一个【目标值】,而他那篇论文的标题自己就写着 The Search for Methods。 【显式】Bloom, B. S. (1984). The 2 Sigma Problem: The Search…
【锚点】这一篇只钉一个判断:【饱和】的最小单位不是【访谈人数】,而是【信息增量】。田野和档案研究里最贵的省略号,不是『没什么发生』,而是『大家都这么说』。 【显式】Guest、Bunce 和 Johnson(2006)对 36 项质性研究的分析显示:同质样本里,大约 12 次访谈后,新信息出现速度明显下降;异质样本常需要更多。这里的关键不是把 12…
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