coef.fracdiff fd-methods confint.fracdiff confint.fracdiff diffseries diffseries fdGPH fdGPH fdSperio fdSperio fitted.fracdiff fd-methods fracdiff fracdiff fracdiff.sim fracdiff.sim fracdiff.var fracdiff.var logLik.fracdiff fd-methods print.fracdiff fd-methods print.summary.fracdiff fd-methods residuals.fracdiff fd-methods summary.fracdiff fd-methods vcov.fracdiff fd-methods