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Speculative bubbles and herding in cryptocurrencies

Financial Innovation 2022年第1期8卷 2137-2169页

作者： ozkan haykir Ibrahim Yag Finance and Banking Department Nigde Omer Halisdemir UniversityNigdeTurkey Accounting and Finance Department Nevsehir HacıBektas Veli UniversityNevsehirTurkey

This study investigates speculative bubbles in the cryptocurrency market and factors affecting bubbles during the COVID-19 *** results indicate that each cryptocurrency covered in the study presented ***,we found that explosive behavior in one currency leads to explosivity in other *** the pandemic,herd behavior was evident among investors;however,this diminishes during bubbles,indicating that bubbles are not explained by herd *** cryptocurrency and market-specific factors,we found that Google Trends and volume are positively associated with predicting speculative bubbles in time-series and panel probit ***,investors should exercise caution when investing in cryptocurrencies and follow both crypto currency and market-related factors to estimate *** liquidity,volatility,and Google Trends measures are used for robustness analysis and yield similar ***,our results suggest that bubble behavior is common in the cryptocurrency market,contradicting the efficient market hypothesis.

关键词： Cryptocurrency Bubbles Co-explosivity Herding COVID-19 pandemic

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Three-dimensional MR and axial CT colonography versus conventional colonoscopy for detection of colon pathologies

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World Journal of Gastroenterology 2006年第15期12卷 2345-2350页

作者： Rahime haykir Serdar Karakose Aydin Karabacakoglu Mustafa Sahin Ertugrul Kayacetin Department of Radiology Selcuk University Meram Medical Faculty KonyaTurkey Department of Surgery Selcuk University Meram Medical Faculty KonyaTurkey Department of Gastroenterology Selcuk University Meram Medical Faculty KonyaTurkey

AIM： To evaluate the sensitivity and specificity of MR colonography （MRC） and CT performance in detecting colon lesions, and to compare their sensitivity and specificity with that of conventional colonoscopy. METHODS： Forty-two patients suspected of having colonic lesions, because of rectal bleeding, positive fecal occult blood test results or altered bowel habits, underwent the examinations. After insertion of a rectal tube, the colon was filled with 1000-1500 mL of a mixture of 9 g/L NaCI solution, 15-20 mL of 0.5 mmol/L gadopentetate dimeglumine and 100 mL of iodinized contrast material. Once colonic distension was achieved, three-dimensional gradient-echo （3D-GRE） sequences for MR colonography and complementary MR images were taken in all cases. Immediately after MR colonography, abdominal CT images were taken by spiral CT in the axial and supine position. Then all patients were examined by conventional colonoscopy （CC）. RESULTS： The sensitivity and specificity of MRC for colon pathologies were 96.4% and 100%, respectively. The percentage of correct diagnosis by MRC was 97.6%. The sensitivity and specificity of CT for colon pathologies were 92.8%, 100%, respectively. The percentage of correct diagnosis by CT was 95.2%. CONCLUSION： In detecting colon lesions, MRC achieved a diagnostic accuracy similar to CC. However, MRC is minimally invasive, with no need for sedation or analgesics during investigation. There is a lower percentage of perforation risk, and all colon segments can be evaluated due to multi-sectional imaging availability; intramural, extra-intestinal components of colonic lesions, metastasis and any additional lesions can be evaluated easily. MRC and CT colonography are new radiological techniques that promise to be highly sensitive in the detection of colorectal mass and inflammatory bowel lesions.

关键词： MR colonography CT colonography Colorectal mass Inflammatory bowel disease Conventional colonoscopy

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