最近在看一篇多层模型的文章,如下: Griffin, L. B. B. (2014). Day-level fluctuations in stress and engagement in response to workplace incivility: a diary study. Work & Stress, 28(2), 124-142.
在页码134页,作者提到,
However, there was a significant, negative main effect of time on daily stress (B = 0.01, SE = 0.00, t(228.00) = 2.96, p < .01) and on daily engagement (B = 0.02, SE = 0.00, t(251.03) = 3.94, p < .01).
这个地方没有弄明白,问题如下:
1.为何t的自由度会是小数?
2.表格2和表格3中,作者将时间按照分类变量进行处理(看起来是进行了虚拟编码),为何文中却只报告了一个回归系数?


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