Choudhry, Taufiq - In: Manchester School 70 (2002) 6, pp. 768-91
The stochastic structure of time-varying betas from 15 companies in the UK is investigated. Time-varying betas are estimated by means of the bivariate MA-GARCH model. The stochastic structure is investigated by means of two fractional integration tests, the Geweke and Porter-Hudak and the...