[求助]SARA中的Z-score怎么跟其它方法算出来的不一样？

[清风出袖]

后学楷模，我辈敬仰。谢谢！

 

[ibid]

I've finally given up trying to make out the differentiation between Z-scores calculated by SARA and the method proposed in Yang's book, 'An Introduction to Corpus Linguistics'. I took 动态语法's suggestion "最好是找到不同语料库的相匹配的原始数据，然后用同一个统计软件计算", and left this issue unsolved.
However, by making a few tests, I don't tend to believe that the differentiation is caused by different delimitations of span. I use the clearest way to define S, left 5 and right 5, or left 4 and right 4, etc. Listed below are my tests:

C': co-occurrence with the node
C: occurrence of the collocate
W: total number of words in BNC
N: occurrence of the node word

 

[ibid]

本来想上传文件的，没找到什么地方可以。懒得找了，没有表格的数据，大家凑合看看吧。
N (anything) =27487, C (else) =19931
Z-score
BNC proposed method
left=5 right=5 C’ =2295 321.4 287.9
left=4 right=4 C’ =2265 356.1 315.6
left=3 right=3 C’ =2223 405.2 352.8

 

[ibid]

看来效果不好，哪里上传啊？我把我的东西传上去！

 

[dzhigner]

Click on "回复", instead of editing your post in "快速回复", and the upload widget you'll see.

 

[ibid]

回复：[求助]SARA中的Z-score怎么跟其它方法算出来的不一样？

thanks, dzhigner.http://forum.corpus4u.org/upload/forum/2005110413272140.doc

 

[happyw]

用SARA算BNC里的一些搭配词的z值，放到专门算Z-score 的软件CalcZ里检验，结果差得很远，这是怎么回事啊？

据说，SARA软件里的公式可能有flaws.