Stability of the Correlation Between Book and Market Value at Risk as a Measure of Banks' Information Transparency

One of the main demands of investors (depositors and shareholders) of banks is transparency. But in addition to the requirements for meeting this demand, measuring how to meet it has also become a challenge. So far, researchers have proposed different qualitative criteria of transparency. In this study, while introducing the correlation coefficient between book and market value at risk’s (VaR’s) as a criterion of transparency, we seek to examine the stability of this criterion in different economic conditions. For this purpose, first, by using the e-garch model, the value at risk was estimated based on the balance sheet (book) information and also the market information of the banks' shares, then by calculating the correlation coefficients between book and market VaR’s under normal conditions, we predict book and market VaR’s using vector auto-regressive (VAR) models, along with defining three stress scenarios (Mild - Severe - hyper stress); then we examined the significance of the difference between the calculated correlation coefficients in the three stress test modes and thus tested the stability of the correlation coefficient of the defined scenarios. The findings showed that with the exception of the correlation caused by the unemployment rate factor in mild and hyper stress scenarios, in other cases, no evidence of H۰ rejection was found, indicating the stability of the correlation coefficient between book and market VaRs as a measure of transparency.

کلیدواژه ها:

Information Transparency ، Value at Risk (VaR) ، Vector Auto-Regressive Model (VAR) ، Correlation coefficient ، and Stress Test