ANOVA

這幾天為同事的功課籌謀。同事要用統計學分析幾十份問卷，不知如何做起。見到參考期刊裡提到ANOVA，知道自己應付不來，便想找人請槍。不知怎的就找上我。說實話，我讀書時沒有學過ANOVA，但一直也想試一試。碰巧有另一位同事之前做過研究，懂得怎樣用。既然有人請教，我就大膽接受了這個挑戰。

雖然請槍的同事很麻煩，跟我的關係也不大好，但看在有得玩，又有參考資料，這次就算賣個人情，將來或許有用處。

找網上資料鑽研，讀到如下的內容，正切合現在的處境：

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Charles McCreery:

There are usually three complementary methods for mastering any new intellectual or artistic task; these are, in ascending order of importance:

1. reading books about it
2. observing how other people do it
3. actually doing it oneself

This tutorial focuses on the second of these methods. It is based on handouts that I developed when teaching first-year psychology students at Magdalen College, Oxford. The core of the tutorial is a worked example from an Oxford University Prelims Statistics examination paper. I have therefore placed this section in prime position; however, in teaching the order of events was different, and more nearly corresponded to the three-fold hierarchy of methods given above:

1. The student was invited to read one of the chapters on the Recommended Reading list, given in Section 5. He or she would also have been expected to attend a lecture on the topic in question at the Department of Experimental Psychology.
2. The student would attend a tutorial, in which we would go through the worked example shown here. He or she would take away the handouts shown in Sections 3 and 4, which were designed to give structure to the topic and help them when doing an example on their own.
3. They would be given another previous examination question to take away and do in their own time, which would be handed in later for marking.

I am strongly in favour of detailed worked examples; following one is the next best thing to attempting a question oneself.

Mccreery, Charles. “Charles McCreery.” celiagreen.com. 4 Apr. 2008 <www.celiagreen.com/charlesmccreery/statistics/chisquare.pdf>

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First-year Statistics for Psychology Students Through Worked Examples

1. The Chi-square test (PDF)
Oxford Forum, Psychological Paper No. 2007-1.

2. Probability and Bayes’ Theorem (PDF)
Oxford Forum, Psychological Paper No. 2007-2.

3. Analysis of Variance (PDF)
Oxford Forum, Psychological Paper No. 2007-3.

Tutorials devised for first-year psychology students at Oxford University.

http://www.celiagreen.com/charlesmccreery.html