TWI702556B - A system and a method for evaluating probability-weighted probability of default under multiple economic scenarios - Google Patents
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Description
本揭露是有關於一種數位風險控管技術,且特別是有關於一種評估多種經濟情境下機率加權違約機率的系統及方法。 This disclosure relates to a digital risk control technology, and in particular, relates to a system and method for evaluating probability-weighted default probability under multiple economic scenarios.
依據國際財務報告準則第9號(International Financial Reporting Standard 9;IFRS 9),其提出了預期信用損失應藉由評估各種可能結果而決定不偏且機率加權平均金額。然而在國際財務報告準則第9號中,並沒有對如何評估各種可能結果以獲取不偏且機率加權平均金額的方式進行說明。 According to IFRS 9 (International Financial Reporting Standard 9; IFRS 9), it proposes that the expected credit loss should be determined by evaluating various possible outcomes to determine the unbiased and probability-weighted average amount. However, IFRS 9 does not explain how to evaluate various possible outcomes to obtain an unbiased and probability-weighted average amount.
為配合我國於107年1月1日接軌國際財務報告準則第9號,如何衡量預期信用損失應藉由評估各種可能結果而決定不偏且機率加權平均金額為本領域技術人員所面臨的課題。 In order to comply with my country's compliance with International Financial Reporting Standards No. 9 on January 1, 107, how to measure expected credit losses should be determined by assessing various possible results and determining the unbiased and probability-weighted average amount is a problem faced by those skilled in the art.
本發明提供一種評估多種經濟情境下機率加權違約機率的系統以及方法,藉由過去歷史的總體經濟指標資訊而分析未來各種可能的結果發生的機率,進而獲取不偏且機率加權違約機率,配合違約損失率(Loss Given Default,LGD)及違約曝險額(Exposure at Default,EAD)以計算違約損失金額。 The present invention provides a system and method for evaluating probability-weighted default probabilities under multiple economic scenarios, and analyzes the probabilities of various possible future results based on the overall economic indicator information in the past history, thereby obtaining unbiased and probability-weighted default probabilities, and matching default losses Rate (Loss Given Default, LGD) and exposure at default (Exposure at Default, EAD) to calculate the amount of default loss.
本揭露一實施例評估多種經濟情境下機率加權違約機率的系統具有輸入單元、儲存單元以及處理單元。輸入單元接收相應於經濟指標的多個指標資訊。儲存單元儲存指標資訊。處理單元連接於輸入單元及儲存單元。處理單元對每一指標資訊執行分類程序,以獲取每一指標資訊所相應的指數變化類型以及情境類型。處理單元還依據指數變化類型以及情境類型分別計算指標資訊中屬於相同的指數變化類型以及情境類型的數量,處理單元還分別依據指數變化類型計算在相同的指數變化類型中的每一情境類型發生的機率作為權重,並依據每一指數變化類型以及情境類型所對應的權重以及違約機率,獲取機率加權違約機率。 According to an embodiment of the present disclosure, a system for evaluating probability-weighted default probability under multiple economic scenarios has an input unit, a storage unit, and a processing unit. The input unit receives multiple index information corresponding to the economic index. The storage unit stores indicator information. The processing unit is connected to the input unit and the storage unit. The processing unit performs a classification procedure on each indicator information to obtain the index change type and the situation type corresponding to each indicator information. The processing unit also calculates the number of the same index change type and situation type in the indicator information according to the index change type and the situation type. The processing unit also calculates the number of each situation type in the same index change type according to the index change type. The probability is used as the weight, and the probability weighted default probability is obtained according to the weight and the default probability corresponding to each index change type and situation type.
本揭露一實施例評估多種經濟情境下機率加權違約機率的方法具有步驟:接收相應於經濟指標的多個指標資訊;對每一該些指標資訊執行分類程序,以獲取每一該些指標資訊所相應的指數變化類型以及情境類型;依據該指數變化類型以及該情境類型分別計算該些指標資訊中屬於相同的該指數變化類型以及該情境類型的數量,以依據該數量獲取在相同的該指數變化類型中的每一該情境類型發生的機率作為權重;以及依據每一該指數變化類 型以及該情境類型所對應的權重以及違約機率,獲取機率加權違約機率。 The method for evaluating probability-weighted default probability under multiple economic scenarios in an embodiment of the present disclosure has the steps of: receiving multiple indicator information corresponding to economic indicators; performing a classification process on each of the indicator information to obtain each of the indicator information. The corresponding index change type and situation type; according to the index change type and the situation type, the number of the same index change type and the same situation type in the index information is calculated, so as to obtain the same index change according to the number The probability of occurrence of the situation type in each of the types is used as the weight; and the type according to each index change Type and the corresponding weight and default probability of the situation type, obtain the probability weighted default probability.
基於上述,本揭露提供一種評估多種經濟情境下機率加權違約機率的系統以及方法,以藉由過去歷史的總體經濟指標資訊而分析未來各種總體經濟情境可能發生的機率,以藉由此機率以及相應不同總體經濟情境的違約機率進而獲取不偏且機率加權違約機率,配合違約損失率(Loss Given Default,LGD)及違約曝險額(Exposure at Default,EAD)以計算預期信用損失金額。 Based on the above, this disclosure provides a system and method for evaluating probability-weighted default probability under multiple economic scenarios, so as to analyze the probabilities that various general economic scenarios may occur in the future based on historical overall economic indicator information, so as to use this probability and corresponding The default probabilities of different overall economic scenarios are then obtained to obtain an unbiased and probability-weighted default probability, combined with Loss Given Default (LGD) and Exposure at Default (EAD) to calculate the expected credit loss amount.
為讓本發明的上述特徵和優點能更明顯易懂,下文特舉實施例,並配合所附圖式作詳細說明如下。 In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.
100:評估多種經濟情境下機率加權違約機率的系統 100: A system for evaluating probability-weighted probability of default in a variety of economic scenarios
110:輸入單元 110: Input unit
120:儲存單元 120: storage unit
130:處理單元 130: processing unit
S210~S250、S310~S360:步驟 S210~S250, S310~S360: steps
圖1繪示本揭露一實施例評估多種經濟情境下機率加權違約機率的系統的示意圖。 FIG. 1 shows a schematic diagram of a system for evaluating probability-weighted default probability in various economic scenarios according to an embodiment of the present disclosure.
圖2繪示本揭露一實施例評估多種經濟情境下機率加權違約機率的系統執行評估機率加權違約機率的方法的流程圖。 FIG. 2 shows a flowchart of a method for evaluating a probability-weighted default probability executed by a system for evaluating a probability-weighted default probability in a variety of economic scenarios according to an embodiment of the present disclosure.
圖3繪示本揭露一實施例處理單元執行分類程序的流程圖。 FIG. 3 shows a flowchart of a classification procedure executed by a processing unit according to an embodiment of the disclosure.
本揭露提供了一種評估多種經濟情境下機率加權違約機率的系統及方法,用以通過歷史中的總體經濟指標以及其相應的時間點,並站在歷史的角度看向未來的總體經濟情境,藉此以對現 有的歷史總體經濟指標進行量化分析,進而產生未來各種總體經濟情境可能發生的機率,並據此獲取在各種情境下不偏且機率加權的風險情形。 This disclosure provides a system and method for evaluating probability-weighted default probabilities in a variety of economic scenarios. It is used to look at the general economic situation in the future from a historical perspective through historical general economic indicators and their corresponding time points. This to present Some historical overall economic indicators are quantitatively analyzed to generate the probabilities that various general economic scenarios may occur in the future, and based on this, to obtain unbiased and probability-weighted risk scenarios in various scenarios.
請參照圖1,圖1繪示本揭露一實施例評估多種經濟情境下機率加權違約機率的系統的示意圖。此評估多種經濟情境下機率加權違約機率的系統100具有輸入單元110、儲存單元120以及處理單元130。
Please refer to FIG. 1. FIG. 1 is a schematic diagram of a system for evaluating probability-weighted default probability under multiple economic scenarios according to an embodiment of the present disclosure. The
輸入單元110用以輸入各類型的資料至評估多種經濟情境下機率加權違約機率的系統100,特別是,使用者可以通過輸入單元110輸入相應於經濟指標的多個指標資訊。舉例來說,經濟指標可以是國內生產總值(Gross Domestic Product,GDP),多個指標資訊則為每季或每年的國內生產總值實際的數值。在本揭露的其他實施例中,經濟指標例如可以是消費者物價指數,而多個指標資訊為每季或每年的消費者物價指數。本揭露並不限制於經濟指標的類型。
The
在本揭露的一個實施例中,若評估多種經濟情境下機率加權違約機率的系統100是適用於具有網路架構的環境時,輸入單元110是以通訊晶片進行實作,通訊晶片可為支援全球行動通信(Global System for Mobile communication,GSM)、個人手持式電話系統(Personal Handy-phone System,PHS)、碼多重擷取(Code Division Multiple Access,CDMA)系統、寬頻碼分多址(Wideband Code Division Multiple Access,WCDMA)系統、長期演進(Long
Term Evolution,LTE)系統、全球互通微波存取(Worldwide interoperability for Microwave Access,WiMAX)系統、無線保真(Wireless Fidelity,Wi-Fi)系統或藍牙的信號傳輸的元件。而若評估多種經濟情境下機率加權違約機率的系統100是以單一裝置的形式運行,則輸入單元110可以為鍵盤、滑鼠、觸控螢幕、觸控板等可用於輸入的硬體設備。
In an embodiment of the present disclosure, if the
儲存單元120用以儲存運行建立評估多種經濟情境下機率加權違約機率的系統100的必要軟體、資料以及各類程式碼。特別是,儲存單元120儲存了使用者通過輸入單元110輸入的指標資訊。儲存單元120可以是任何型態的固定或可移動隨機存取記憶體(Random Access Memory,RAM)、唯讀記憶體(Read-Only Memory,ROM)、快閃記憶體(flash memory)、硬碟(Hard Disk Drive,HDD)、固態硬碟(Solid State Drive,SSD)或類似元件或上述元件的組合。
The
處理單元130與輸入單元110及儲存單元120連接。處理單元130可以是中央處理單元(Central Processing Unit,CPU),或是其他可程式化之一般用途或特殊用途的微處理器(Microprocessor)、數位信號處理器(Digital Signal Processor,DSP)、可程式化控制器、特殊應用積體電路(Application Specific Integrated Circuit,ASIC)或其他類似元件或上述元件的組合,本揭露不限於此。
The
為了讓銀行在評估可能發生的違約情形時,能夠對所有 不同的情境與結果進行全面、同步的評估,在本揭露的實施例中會通過歷史中經濟指標的變化以及市場的趨勢進行評比,藉此以評估不同情境的機率,並基於各種情境的機率以及違約機率評估信用風險。 In order to allow the bank to assess all possible defaults Different scenarios and results are comprehensively and simultaneously evaluated. In the embodiments of this disclosure, the changes in historical economic indicators and market trends are evaluated to evaluate the probabilities of different scenarios, based on the probabilities of various scenarios and The probability of default assesses credit risk.
圖2繪示本揭露一實施例評估多種經濟情境下機率加權違約機率的系統執行評估機率加權違約機率的方法的流程圖。以下將通過圖1與圖2說明本揭露評估多種經濟情境下機率加權違約機率系統及方法運行的細節。 FIG. 2 shows a flowchart of a method for evaluating a probability-weighted default probability executed by a system for evaluating a probability-weighted default probability in a variety of economic scenarios according to an embodiment of the present disclosure. Hereinafter, the details of the operation of the probability-weighted default probability system and method for evaluating the probability-weighted probability of default in various economic scenarios of the present disclosure will be described with reference to FIGS. 1 and 2.
在步驟S210,處理單元130獲取相應於經濟指標的多個指標資訊。須先說明的是,在本實施例中,經濟指標是採用國內生產總值(Gross Domestic Product,GDP)變化率作為主要的指標,而指標資訊則是以每季國內生產總值的變化率。舉例來說,在民國104年的第1季至第4季,國內生產總值的變化率分別為1.54%、2.02%、1.94%、3.57%,此每一筆資料即為指標資訊。也就是說,這些指標資訊之間會有時間序列的關係。處理單元130會經由輸入單元110接收使用者所輸入的指標資訊,或者是由儲存單元120中獲取相應的指標資訊。
In step S210, the
在步驟S220,處理單元130對每一指標資訊執行分類程序,以獲取每一指標資訊相應的指數變化類型以及情境類型。
In step S220, the
在下方的描述中,處理單元130正在執行分類程序的指標資訊稱為當前指標資訊。須先說明的是,在執行分類程序時,處理單元130雖然是針對當前指標資訊進行分類,然而在其實際的
意涵上,是對影響當前指標資訊的過往指標資訊,以及當前指標資訊所影響的未來指標資訊進行整體情境的分類。以下將詳述處理單元130如何執行分類程序。
In the following description, the index information that the
請參照圖3,圖3繪示本揭露一實施例處理單元執行分類程序的流程圖。在實際的經濟環境中,由於不同時間點的經濟情形會因為整體環境的變化而帶有延續性,因此在本實施例中,將以過去連續兩季的經濟指標進行分類,進而由當時時間點分析未來的情境類型,並依據不同經濟情境類型計算屬於不同經濟情境類型的權重。 Please refer to FIG. 3. FIG. 3 is a flowchart of a classification procedure executed by the processing unit according to an embodiment of the disclosure. In the actual economic environment, because the economic situation at different time points will have continuity due to changes in the overall environment, in this embodiment, the economic indicators of the past two consecutive quarters will be classified, and then the economic indicators at the time Analyze the future situation types, and calculate the weights of different economic situation types according to different economic situation types.
具體來說,在步驟S310,處理單元130獲取當前指標資訊的前一期指標資訊及前二期指標資訊。承上所述民國104年第1季至第4季的例子,若當前指標資訊為民國104年第3季(1.94%),則前一期指標資訊即為民國104年第2季的指標資訊(2.02%),而前二期指標資訊則為民國104年第1季的指標資訊(1.54%)。
Specifically, in step S310, the
在步驟S320,處理單元130獲取第一經濟指標變化以及第二經濟指標變化。第一經濟指標變化為當前指標資訊與前一期指標資訊之間的變化,而第二經濟指標變化為前一期指標資訊與前二期指標資訊之間的變化。承上所述,在本實施例的第一經濟指標變化為民國104年第3季指標資訊與104年第2季指標資訊之間的變化,即:1.94%-2.02%=-0.08%。第二經濟指標變化為民國104年第2季的指標資訊與民國104年第1季的指標資訊之間的變化,即:2.02%-1.54%=0.48%。
In step S320, the
在步驟S330,處理單元130會依據第一經濟指標變化以及第二經濟指標變化判斷相應該當前指標資訊的該指數變化類型。在本揭露的一實施例中,指數變化類型分為三種,分別為第一經濟指標變化與第二經濟指標變化皆大於0、第一經濟指標變化與第二經濟指標兩者變化為反向以及第一經濟指標變化與第二經濟指標變化皆小於0。承前例,對於民國104年第3季的當前指標資訊而言,其指數變化類型即屬於第一經濟指標變化與第二經濟指標變化兩者反向。
In step S330, the
在步驟S340,處理單元130還獲取接續當前指標資訊的後一期指標資訊,以獲取第三經濟指標變化。承前例,當前指標資訊的後一期指標資訊為104年第4季的指標資訊,即3.57%。第三經濟指標變化為當前指標資訊與後一期指標資訊之間的變化,即3.57%-1.94%=1.63%。
In step S340, the
在步驟S350,處理單元130還依據當前指標資訊及預設時間區間獲取於預設時間區間中的平均經濟指標變化。在本揭露的實施例中,預設時間區間是相應當前指標資訊的時間起算後的第12個月至第24個月。也就是說,處理單元130所獲取的是當前經濟指標所在的時間點起算的下一年一整年度的平均經濟指標變化。承前例,當前指標資訊為民國104年第3季時,處理單元130獲取的是從民國105年第3季至民國106年第2季之間的平均經濟指標變化。例如,若民國105年第3季至民國106年第2季之間的指標參數變化率分別為2.92%、2.71%、1.99%、3.25%,
則平均經濟指標變化為2.72%。
In step S350, the
在步驟S360,處理單元130還依據第三經濟指標變化以及平均經濟指標變化判斷當前指標資訊所屬的情境類型。
In step S360, the
詳細來說,第三經濟指標變化是當前指標資訊後的下一季經濟指標變化(即:短期變化),平均經濟指標變化是當前指標資訊後的下一年平均經濟指標變化(即:中長期變化)。也就是說,處理單元130是通過當前指標資訊所在的時間點來看未來的市場在短期及中長期的經濟情境類型。以前述例子進行說明,即為連續兩期GDP變化率的變化量為反向的情形下,未來的市場經濟在短期及中長期是什麼情境類型。在本實施例中,情境類型會依據短期與中長期分成九種不同的情境類型。短期情境類型具有短期擴張、短期持平以及短期收縮,長期情境類型具有長期擴張、長期持平以及長期收縮。因此,依據短期情境類型與長期情境類型獲得的九種不同情境類型請參考下表一:
在本揭露的一實施例中,處理單元130會對所有指標資訊依序執行分類程序,以找到每個指標資訊所屬的指數變化類型以及情境類型。在本揭露的其他實施例中,處理單元130也可以僅依據特定時間區間中的指標資訊執行分類程序,本揭露並不限於此。
In an embodiment of the present disclosure, the
請回到圖2,於處理單元130執行完分類程序,在步驟S230,處理單元130依據指數變化類型以及情境類型分別計算指標資訊中屬於相同的指數變化類型以及情境類型的數量。請參考下述表二,表二是所有指數變化類型及情境類型的組合結果。
Please return to FIG. 2, after the
在步驟S240,處理單元130依據屬於相同的指數變化類型的數量計算在相同的指數變化類型中的每一情境類型發生的機率,以作為權重。如同前述,指數變化類型是依據過去兩季指標資
訊的變化進行分類的結果,情境類型發生的機率則是站在當前指標資訊的時間點看向未來的結果。因此,對於已知的指標資訊,未來可能發生的不同情境類型的總和應為100%。基此,處理單元會依據指數變化類型而將每一情境類型的指標資訊的數量轉化為相應的機率,並且將每一情境類型在歷史中所發生的機率作為未來可能發生不同情境類型的權重。請參考表三,表三是相應所有指數變化類型及情境類型的權重。
In step S240, the
在步驟S250,處理單元130依據每一指數變化類型以及情境類型所對應的權重以及違約機率,獲取機率加權違約機率。詳細來說,在不同的總體經濟情境類型下以及不同的期間會對應至不同的預設違約機率。因此,在已知的指數資訊下,可以進一步通過所知的指數資訊所對應的指數變化類型中的每一情境類型的權重,並經由權重與相應總體經濟環境及不同期間的預設違約機率的乘積,處理單元130可以進一步獲取機率加權違約機率。
In step S250, the
舉例來說,若當前閱讀本實施例的時點是在106年第4季,且在106年第2季至第4季的指標資訊分別為3.25%、2.48%以及2.28%,而處理單元130在判斷未來一年的機率加權違約機率時,會先依據指標資訊判斷在過去兩季中指標資訊變化皆為負值,因而獲取表三中第一經濟指標變化與第二經濟指標變化皆小於0的該欄中的加權權重。接著,處理單元130會進而獲取在不同情境類型相應的違約機率,並基於加權權重與違約機率的乘積獲取機率加權違約機率。
For example, if the current reading of this example is in the fourth quarter of 106, and the indicator information in the second to fourth quarters of 106 is 3.25%, 2.48%, and 2.28%, respectively, and the
不僅如此,處理單元130還可以通過輸入單元110接收違約損失率(Loss Given Default,LGD)及違約曝險額(Exposure at Default,EAD),處理單元130並依據機率加權違約機率、違約損失率以及違約曝險額產生預期信用損失(Expected Credit Loss,ECL)。基此,通過此評估機率加權違約機率的系統,可以評估各
種可能結果而產生不偏且機率加權的違約損失金額。
Not only that, the
以下將說明如何分辨第三經濟指標變化、平均經濟指標變化屬於擴張、持平、收縮階段的過程。 The following will explain how to distinguish the change of the third economic indicator and the change of the average economic indicator belonging to the process of expansion, flatness and contraction.
在本揭露的一實施例中,處理單元130會依據所有歷史指標資訊的變化進行統計分析,以獲取指標資訊的變化中信心水準為95%的信賴區間。若判斷的指標資訊的變化落於此信賴區間內,則表示景氣為持平,若高於此信賴區間則表示景氣為擴張,若低於此信賴區間則表示景氣為收縮。
In an embodiment of the present disclosure, the
在本揭露的實施例中,對於短期,即第三經濟指標變化,信賴區間是[-0.4%,0.38%]。也就是說,若第三經濟指標變化落在-0.4%至0.38%的區間,則表示在短期中景氣為持平,而若第三經濟指標變化大於0.38%,則表示在短期中景氣為擴張,若第三經濟指標變化小於-0.4%,則表示在短期中景氣為收縮。 In the embodiment of the present disclosure, for the short-term, that is, the third economic indicator change, the confidence interval is [-0.4%, 0.38%]. In other words, if the change of the third economic indicator falls within the range of -0.4% to 0.38%, it means that the economy is flat in the short term, and if the change of the third economic indicator is greater than 0.38%, it means that the economy is expanding in the short term. If the change of the third economic indicator is less than -0.4%, it means that the economy is contracting in the short term.
而對於長期,即平均經濟指標變化,信賴區間是[-0.29%,0.18%]。也就是說,若平均經濟指標變化落在-0.29%至0.18%的區間,則表示在長期中景氣為持平,而若平均經濟指標變化大於0.18%,則表示在長期中景氣為擴張,若平均經濟指標變化小於-0.29%,則表示在長期中景氣為收縮。 For the long-term, that is, the average economic indicator change, the confidence interval is [-0.29%, 0.18%]. In other words, if the average economic indicator change falls within the range of -0.29% to 0.18%, it means that the economy is flat in the long-term. If the average economic indicator change is greater than 0.18%, it means that the economy is expanding in the long-term. The change in economic indicators is less than -0.29%, which means that the economy is contracting in the long term.
綜上所述,本揭露所提供的評估機率加權違約機率的系統及方法中,處理單元會用以通過歷史中的總體經濟指標進行分類,以站在歷史總體經濟指標的觀點往前看向未來的總體經濟指標。藉此,以通過歷史總體經濟指標與未來總體經濟指標的關連評 估未來各種總體經濟情境可能發生的機率並設置相應的權重。並且,處理單元還藉由未來各種總體經濟情境可能發生的機率以及其相應的違約機率獲取在不同情境下的機率加權違約機率以及其相應的時間點,並站在歷史的角度看向未來的總體經濟情境,藉此以獲取在現有的歷史總體經濟指標下,未來各種總體經濟情境可能發生的權重(機率),並藉由此權重以及各種總體經濟情境下所相應的違約機率,以獲取在各種情境下不偏且機率加權的風險情形。 In summary, in the system and method for assessing probability-weighted default probability provided in this disclosure, the processing unit will be used to classify historical overall economic indicators, and look forward to the future from the perspective of historical overall economic indicators Overall economic indicators. In this way, through the evaluation of the relationship between historical overall economic indicators and future overall economic indicators Estimate the probability of various general economic scenarios in the future and set corresponding weights. In addition, the processing unit also obtains the probability-weighted default probability under different scenarios and their corresponding time points based on the probabilities that may occur in various general economic scenarios in the future and their corresponding default probabilities, and looks at the overall future from a historical perspective. Economic context, to obtain the weights (probabilities) that may occur in various general economic scenarios in the future under the existing historical overall economic indicators, and use this weight and the corresponding default probability under various general economic scenarios to obtain various Unbiased and probability-weighted risk situations in the context.
雖然本發明已以實施例揭露如上,然其並非用以限定本發明,任何所屬技術領域中具有通常知識者,在不脫離本發明的精神和範圍內,當可作些許的更動與潤飾,故本發明的保護範圍當視後附的申請專利範圍所界定者為準。 Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.
100‧‧‧評估多種經濟情境下機率加權違約機率的系統 100‧‧‧A system for evaluating probability-weighted default probability in multiple economic scenarios
110‧‧‧輸入單元 110‧‧‧Input Unit
120‧‧‧儲存單元 120‧‧‧Storage Unit
130‧‧‧處理單元 130‧‧‧Processing unit
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