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Tag Archives: Vote

第六屆香港立法會投票記錄分析(2016-2018)

12 Saturday May 2018

Posted by chico_x in Article, news story

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LegcoHK, Legislation, PCA, Python, Vote

本屆立法會波瀾起伏,6名議員先後被取消資格(俗稱「DQ」)。時值2018年3月補選之際,我們進行該項研究,通過本屆投票記錄的數據,爲公衆還原各議員的「政治肖像」。從這份數據驅動的光譜與投票熱力圖,我們可以看出,議員們究竟是言行一致,還是逢場作戲。在公衆熱烈討論「投票率新低」和「田忌賽馬失敗」之餘,我們也要知道,誰當選固然重要,當選後做什麼也許更加值得關注,會議的提案與投票記錄詳細地反應了議員的行爲。

議員投票傾向光譜

從第五屆立法會開始,電子投票記錄以XML結構化數據的形式公佈於網站上,供公衆下載。我們通過爬蟲蒐集第六屆立法會議員從2016年11月10日至2018年3月29日做出的電子投票記錄,共27426票紀錄,對於每個議案,議員可能產生五種不同的表決結果——贊成、反對、棄權、缺席或出席(即出席會議,但未投下「贊成」、「反對」或「棄權」中的任何一票;立法會小百科 )。將不同的表決結果數值化後,使用主成分分析法(Principal Component Analysis,以下簡稱為 PCA),計算2萬票紀錄反映出的最大分歧,即主維度(Principal Axis),記為 PA1。同時我們計算每位議員的投票紀錄在 PA1 上的投影值,即主成分(Principal Component),記爲 PC1。PC1 體現議員之間的相對關係,兩位議員得到的分值越接近,則說明他們的投票傾向也越接近。

按照 PC1 分值由小到大排序,就得到一條數據驅動的「政治光譜」(如下圖所示)。在這條「光譜」中間,是從不投票的梁君彥。越靠近梁君彥的人,投票風格就越溫和。越遠離梁君彥的人,投票風格就越激進。而梁君彥的兩邊,按照議員所屬派別塗色,恰恰是建制和泛民兩派人馬,與常識相符。

1

第六屆立法會(2016-2018)投票傾向光譜(按建制、泛民分類)
(已等比例縮放到第5屆立法會光譜的同等區間)

從相對距離上來看,泛民陣營整體離梁君彥更近,而建制則離得較遠。圖像顯示,建制派整體而言在投票中表現得比泛民更加激進。即建制派的建制立場,要強過泛民的民主立場。

光譜的兩端,分別是鄭松泰和盧偉國,這說明兩人的投票風格差異最大,相比其他議員,他們二者的投票風格最為激進。且根據統計,在投票記錄中,兩人投票意見不相同的提案數(371個)是兩人意見相同提案數量(37個)的十倍之多。

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