A dummy variable is one that takes the value 0 or 1 to indicate the absence or presence of a categorical effect that may be expected to shift the outcome.
In Macrobond, you can create binary series using conditions in the formula language. These formulae need to be applied before the regression analysis.
⇒ Returns 1 if the observation is Q1 or Q3, 0 otherwise
⇒ Returns 1 if the observation is a Friday, 0 otherwise
⇒ Returns 1 if the observation is the last one in a year, 0 otherwise
⇒ Returns 1 if the US GDP y/y growth rate is negative, 0 otherwise