EXRTExternal Radiation Therapy
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Considering the impact of variability (changes) in INF, EXRT and OPN on RTVOL, the mean equation from Table IVc indicates that only DINF have significant negative impact on RTVOL.
However, it is revealed that one period lagged INF, OPN and EXRT significantly influence stock market return volatility.
To capture the degree and direction of long term correlation between RTVOL and time series variables (INF, EXRT and OPN), Granger causality test was conducted.