中央銀行的主要職責在於維持貨幣的供給與物價的穩定、監管金融市場、促進就業與經濟發展等，因此維持適當的中央銀行獨立性 (central bank independence) 有助於一國經濟的穩定發展。現有文獻中關於央行獨立性的研究大多關注的是央行與本國政府之間的獨立性，尚未看到關於各國央行之間獨立性的研究，並且對於各國央行間的關聯也尚未出現完整的規範。為了彌補現有文獻在這方面的缺失，本文以中央銀行會議紀要代表其意見，通過文字探勘的方式從中提取出各國央行的情緒指標，並結合關聯性網絡分析以及最小生成樹的方法，探討樣本國家央行意見的關聯性。本文的研究結果顯示，從長期上看，美國聯準會的意見會對其他國家央行的意見造成影響，而中期上英國與歐盟帶給系統中其他國家的影響超越美國，但在短期上各國輪流擔任央行情緒指標的主導國家且美國作為主導國家的頻率最高、在點陣圖中的分配也較均勻連續。

With the main responsibility of overseeing the monetary system and policy, regulating the money supply, and promoting employment rate and economic development, central bank plays an important role in the economy of a nation. Therefore, it is necessary to maintain proper central bank independence. Among existing literatures, most of them focus on the independence between the central bank and the national government, and there is so far no research on the independence of central banks among various countries. To address the inadequacy of literatures, Minutes of central banks are used to represent as the opinion of the corresponding central bank. Sentiment indicators are extracted by text mining approach and are applied to examine the dependence of the central banks. In addition to Pearson correlation and Granger causality, a network approach based on partial correlation and minimum spanning tree are also used to test central banks dependency. The result shows that opinions of the Federal Open Market Committee (FOMC) can have an influence on the other central banks in long term and short term, however, the influence of the Bank of England and the European Central Bank exceeds that of the FOMC when considering middle term.

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