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Harry Mok:

「曾鈺成為立法會主席，只出席而不會投票所以所有投票結果均為0。」
但圖表顯示曾鈺成的數字是-10, 數據是否有問題?

Short answer: This is a common confusion raised by many audiences. To be short, the process is technically correct. There is not calculation "error". The problem is on interpretation. One should not take the output of PCA as absolute meters. Only the relative numbers matters. Some useful discussions are replicated in comments.

Affected commits: 8b95798

Fixed in: no fix

References:

• http://thehousenews.com/politics/%E7%AB%8B%E6%B3%95%E6%9C%83%E6%8A%95%E7%A5%A8%E5%85%89%E8%AD%9C/

Question: Why "郭偉强" appeared twice in the plot?

Reported for commit: 76b7826
Fixed in commit: 8b95798

Kenneth Chen Wei On: Case of Hon KWOK Wai-Keung's Chinese name is a good case example of data maintenance. When he changed his name from 郭偉強 to 郭偉强 last year, we should have considered the implication of the said change to our data records. Good catch!

Pili Hu: Kenneth Chen Wei On , also 'Dr Joseph LEE' and 'Prof Joseph LEE'. I had this cleansing step in the notebook,
http://bit.ly/1k58I8b I think it would be better to officially give the members an ID. Then we do not have data normalization issue. The same for motion ID. Motion is easier because we can use date+order as ID. Name can have some subtle issues.

Refs:

• https://www.facebook.com/kchenweion/posts/280751805419946