what variables do dummy models represent what are less frequent variables? why are more frequently changing variables used in model? what is the difference between a monthly variable and a dummy variable why a time series variable is considered a less frequent variable? which variable is used to describe the difference from daily and quarterly change of syst what is the dummy variable for a monthly variable what variable is less frequent in econometric what are some strategies for integrating all the variables in a single model when does a model of time series change what variables have continuous change how to use dummy variables how to do intervention analysis for more often changing variables how to use more frequent variables in a trading model why do we use dummy variables why would an intervention be used to measure a variable? how to construct a quarterly model with unequal intervals of time how to model a time series with unequal interval which variable does a econometric model use which variables are unequal and which are less frequent?