what is the appropriate model for coding which statement is superfluous? which of these is an example of a model based on an external factor? what is the appropriate coding/model for this data set what theory is superfluous which of the following is a characteristic of an independent variable? what is the appropriate coding of a model what's the appropriate coding for which theory adds an external variable to a model which is the best account for all the changes between time x and y? what does the model of external factors account for which theory is superfluous which model is appropriate for an example of an external factor? why is the model for external factors superfluous? which statement would be a superfluous statement? which theory is superfluous which is an appropriate method of coding an example of an independent variable? _________. what model do you use to account for the internal factors which is a superfluous theory which statement is superfluous