what is the underlying principle of the r function when you insert the regaria model? how to choose regression models of the model can you use regima regression how to select variable in arima model why do you need to fit regima models does r rima use variable selection when do we apply regarima to the explanatory variables does the underlying principle of the r function mean that the coefficients of regression are the same regardless of the regression process? how to determine a regression model does r modelling affect the coefficient of the explanatory variables what is regima does r use a regarima model r function for regression analysis does a regarima model include dummies or explanatory variables what is the underlying principle of r function auto.arima which variable is not included in the forecast why does r use regrima what model is the underlying principle? does the r regression model have to be r does the r model need to include the dummy variables