Bieszk-Stolorz, Beata - In: Econometrics : open access journal 13 (2025) 1, pp. 1-16
. The coefficients of the PH and AFT exponential models have the same magnitude but have opposite signs. It follows that … there is a symmetric relation between the coefficients. In the case of exponential PH and AFT models, there is a relation of … parameters of both models. In this case also, we can talk about a symmetric relation. The exponential PH model is valid if the …
