方法論

「而家」點計?

年度層用 World Bank 年度 CPI 同年均匯率(可回溯至 1980);「而家」用今日匯率 × 最新年度 CPI 估算，所以係近似值 — 下一版會換月度 CPI。

TripDip 指數

TripDip = 0.6 × Ground + 0.4 × Flight

Ground = (1 − percentile of "now" in own 10y history) × 100
Flight = (1 − rank of fare ÷ expected fare for the distance) × 100

頭條 0–100 分由兩個分項混合:當地物價(佔六成)— 而家嘅體感物價相對該地自己 10 年歷史有幾平(即原本嘅指數);機票(佔四成)— 由香港出發最平嘅來回機票(Aviasales 數據;冇快取價嘅航線用距離估算，會標明「估算」)，再按航距應有嘅票價正規化，同全部目的地排名。每張卡都會顯示兩個分項;只有最新一期有呢個指數。

數據來源

• 消費物價指數:World Bank FP.CPI.TOTL(2010=100)
• 官方匯率:World Bank PA.NUS.FCRF(年均)
• 台灣 CPI 及匯率:行政院主計總處 DGBAS(1981 起)
• 絕對物價水平:由 World Bank PA.NUS.PPP 推導
• 每日匯率:開源 exchange-api(ECB/市場數據)
• 氣候平均:NASA POWER(MERRA-2,2001–2020，首都/主要城市)
• 簽證(特區護照):passport-index-dataset,Ilya Ilyankou(MIT)
• 語言及時區:開源國家數據集(mledoze/countries、dr5hn)

限制與陷阱

• 台灣數據源同其他目的地唔同(DGBAS，非 World Bank),UI 有標明
• 各國 CPI 起始年唔同，每頁有標明
• 歐元區 1999 年前匯率已用官方不可撤銷轉換率拼接
• CPI 係全民籃子，作遊客物價 proxy
• 指數不含機票、酒店淡旺季

航班準時數據

準時榜、航空公司報告卡及各目的地的準時率表,均以香港機場管理局的官方開放航班數據計算——涵蓋香港國際機場所有客運航班的起降。公開 API 只保留約 91 日數據,故 TripDip 每日永久存檔;所載統計涵蓋各頁面標示的期間。

• 準時 = 實際時間距原定時間 15 分鐘之內;提早亦算準時。出發以離閘時間、抵達以到閘時間計算。
• 延誤分級為 ≥15 分鐘、≥1、≥3、≥5 及 ≥6 小時(累計)——最後兩級對應一般旅遊保險開始賠償的延誤門檻。
• 取消航班另行計算,不會混入延誤百分比。
• 共享航班只歸營運航空公司計算——即實際執飛該航班的公司。
• 期內少於 90 班香港航班的航空公司不列入排名;目的地表格亦隱藏該航線少於 30 班的公司。
• 只計香港航段:多段航程中其他航段的延誤不計算在內。
• 颱風頁結合機管局實時數據與香港天文台警告信號;「平日」基準為存檔期間的中位數。

圖片來源(Wikimedia Commons)

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