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很多人(包括我自己在内)对统计分析的结果如何描述,一直比较模糊,在这里,我参阅了一下外文的统计学书籍,以单因素方差分析为例(多因素方差分析类似),跟大家分享一下方差分析结果如果表达。
1. 写出作了何种分析,简要地说明这个分析具体作法;
2. 写出统计分析的结果,包括结果在哪个水平上显著与否、F值、组间和组内自由度、p值;
3. 若组间的差异显著,写出多重比较(如采用Tukey’s post hoc法)的结果;
注:多重比较是在未转换的数据上做的,而不是为了满足方差分析前提假设而转换后的数据;在处理水平较多时,Tukey’s post hoc(Tukey HSD)统计功效较强,而当处理水平不多时,Bonferroni t-test统计功效更强。
4. 写出统计结果所代表的意义。
例如:“A one-way between subjects ANOVA was conducted to compare the effect of sugar on memory for words in sugar, a little sugar and no sugar conditions. There was a significant effect of amount of sugar on words remembered at the p<.05 level for the three conditions [F(2, 12) = 4.94, p = 0.027](F(组间自由度,组内自由度)). Post hoc comparisons using the Tukey HSD test indicated that the mean score for the sugar condition (M = 4.20, SD = 1.30) was significantly different than the no sugar condition (M = 2.20, SD = 0.84). However, the a little sugar condition (M = 3.60, SD = 0.89) did not significantly differ from the sugar and no sugar conditions. Taken together, these results suggest that high levels of sugar really do have an effect on memory for words. Specifically, our results suggest that when humans consume high levels of sugar, they remember more words. However, it should be noted that sugar level must be high in order to see an effect. Medium sugar levels do not appear to significantly increase word memory.”
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