Table 1.

Statistical description of the main variables.

	Return	N95	Wuhan	COVID-19	Mask
Mean	0.016	6.424	7.617	10.058	5.930
Median	0.096	6.417	7.617	10.041	5.872
Maximum	12.423	7.272	9.526	11.439	7.403
Minimum	−19.996	5.429	6.758	9.141	4.997
Std. Dev.	4.129	0.325	0.475	0.486	0.438
Skewness	−0.370	−0.500	0.744	0.625	0.641
Kurtosis	5.895	3.891	4.352	3.273	4.271
Jarque-Bera	68.468	13.739	30.971	12.536	25.008
Probability	0	0.001039	0	0.001896	0.000004
Sum	2.910	1182.072	1401.443	1850.660	1091.151
Sum Sq. Dev.	3119.236	19.308	41.262	43.163	35.151
Observations	184	184	184	184	184