[Corpora-List] Significance tests for n-fold cross validation

[Emad Mohamed]

Dear Corpora Listers,

I have run a number of POS tagging experiments in a 5 fold cross validation
setting. Imagine the results of the 5 folds (in terms of accuracy) are these
fictitious numbers:

93.4%    93.7%     92.9%     93%    93.1%

I then added feature x to the feature set, which gave the following results:

93.7%  94%       92.7%       93.2%   93.4%

My question is: Do I need to use any significance test to show  that adding
feature x really helps? if no, why not? and if yes, what are the appropriate
tests in such a case?

Thank you in anticipation


-- 
Emad Soliman Ali Mohamed
aka Emad Nawfal (*عماد نوفل*)
Suez Canal University, Egypt
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