Holmes, James M; Hutton, Patricia A; Weber, Edward - In: Journal of Business & Economic Statistics 9 (1991) 1, pp. 85-90
Parametric testing of the relationship between research and development (R&D) and firm size is limited by the hypothesized functional form, predominantly assumed to be linear in the logarithms of both variables. With a transformation of variables, the null hypothesis of constant returns to scale...