Which of the following data series are based on quarterly counts of the word "uncertainty" in the context of terms that relate to infectious disease or pandemics? Which of the following data series are based on quarterly counts of the word "uncertainty" in the context of terms that relate to infectious disease or pandemics? The Lewis-Mertens-Stock Weekly Economic Index. The St. Louis Fed Financial Stress Index. The World Pandemic Uncertainty Index. The Chicago Board Options Exchange Volatility Index