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Abstract This paper investigates the power of two methodologies, the tests of Brown, Durbin, and Evans 2 and variable parameter regression, to detect several varieties of instability in the coefficients of a linear regression model. The study reported by Khan 10 on the stability of the demand for money is replicated with variable parameter regression, and his results are in part questioned and in part sharpened.
Kenneth D. Garbade (Tue,) studied this question.