Back藍營民調李四川仍領先 戴立安:用2018「韓流」數據加權會失真
藍營民調李四川仍領先 戴立安:用2018「韓流」數據加權會失真
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自由时报1 hour agoPolitics2 min readChinaView translation

藍營民調李四川仍領先 戴立安:用2018「韓流」數據加權會失真

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民調專家戴立安指出,部分偏藍媒體民調顯示國民黨李四川領先民進黨蘇巧慧6.7個百分點,但其實是錯誤使用2018年「韓流」數據加權所致;他最新民調顯示蘇巧慧支持度43.1%,李四川30.0%,蘇巧慧領先13.1個百分點,並建議應參考2024年區域立委選舉結果而非過時數據進行預測。

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Why It Matters

新北市長選舉是台灣重要的地方選舉之一,歷來受到國民黨與民進黨的激烈競爭。民調在選舉期間扮演重要角色,但不同機構的抽樣方式、加權方法及時間點可能導致結果差異甚鉅。

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部分偏藍媒體所做民調,呈現國民黨新北市長參選人李四川民調領先蘇巧慧局面,與信民協會今日公布的新北市長民調差距極大,引發外界關注。民調專家戴立安今日分析,有些民調是拿2018年「韓流」的數據來做加權,對比現在「洋流」誤差很大,那些機構應該不是刻意的,但會做出誤導民眾的結果。

有媒體民調顯示,國民黨參選人李四川領先民進黨參選人蘇巧慧6.7個百分點。不過,根據戴立安最新民調,蘇巧慧支持度43.1%,李四川支持度30.0%,蘇巧慧領先13.1個百分點,不投票或投廢票9.5%,未明確回答有15.8%。

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戴立安指出,現在是「變天盤」,顯示訊號是要換黨做做看,不能用2018年數字來做加權。他分析,以台北市為例,2024年區域立委選舉藍綠的得票數各半,綠的贏藍大概1萬多票。2024年新北市區域立委選舉,綠的大約拿到46%選票、藍的拿47%,雙方也是五五波。

戴立安揭露,其他民調要做預測,大概都是用「藍57%對上綠43%」,那個板塊加權是李四川固定會贏6至7%,「但那是虛的」,是不當加權產生的現象。

戴立安進一步說,如果目前有機構要把李四川和蘇巧慧的民調結果做預測的話,自己是建議不要用「57%對43%」,不要用拿2018年的數字去推估,要用2024年區域立委得票結果會比較接近。

戴立安舉例,目前有些台北或新北市長的民調,還是告訴你「藍加白大於綠」,但這都是板塊加權的結果。如果「泛藍加白」在新北市是27%,泛綠是37%,其實是泛綠多了10個百分點,但在部分新北市長民調,有些機構把它事後加權「57%比43%」,用2018年的數字去加權,就會是很大的「人工扭轉」,在支持度就會有很大的誤差。

戴立安今日所公布民調,由信民協會委託戴立安負責問卷設計與分析、畢肯市場研究公司執行電訪,從10月6日至10月8日,調查對象為設籍於新北市且年滿20歲之民眾,成功完訪1073人(住宅電話750人、行動電話323人),合併樣本在信賴水準95%時的抽樣誤差最大值為±3.0%。

What to Watch

AI outlook — possibilities, not facts

  • 若民調機構停止使用2018年數據加權並參考2024年區域立委選舉結果,未來新北市長民調將更可能顯示蘇巧慧領先李四川

    Likely · Within weeks

Open Questions

  • 哪些具體民調機構被戴立安指出使用了不當加權方式?
  • 信民協會委託的民調樣本中,不投票或投廢票的比例是否會影響最終選舉結果?
  • 戴立安建議的2024年區域立委選舉結果作為參考基準,在預測市長選舉時的準確度有多高?

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