HOW TO DO AND INTERPRET QUANTILE REGRESSION - EVIEWS

HOW TO DO AND INTERPRET QUANTILE REGRESSION - EVIEWS- SLOPE EQUALITY TEST-SYMMETRIC QUANTILE TEST

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Dear Shobha, should we test the unit root of the variables in the initial step? If they have unit root should we use first differences of the variables in the quantile regression model? In some studies I saw that they used variable's first differences rather than variables itself.