does age change the sign of a variable? what is the sign of age in a quadratic term when you add age to the model, the sign of age becomes positive how much does the age of the writer influence the sign of the dependent variable when you add age to the equation, the sign of age becomes negative when adding age to the model, age is what is the coefficient of age in a model and why is age a dependent variable what is a negative sign for age how to calculate the sign of a variable in a quadratic how does add age to a quadratic equation change the sign of a variable what is the positive sign for age and books published? when a variable is dependent the sign what is the sign of the variable if the coefficient of age is negative, age is negative. when you add age as dependent variable what does the term no book mean in a quadratic rhesus model how to test a dependent variable if age and age are dependent what changes the sign of the variable what is the coefficient of age in a model