This paper attempts to discuss quality and some improvements in high frequency time series data of the nominal gross investment expenses for Brazilian municipalities which are state capitals. We first utilized data for the 2001-2008 period available in Relatórios Resumidos de Execução...

In this paper we study the zero frequency spectral properties of fractionally cointegrated long memory processes and introduce a new frequency domain principal components estimator of the cointegration space and the factor loading matrix for the long memory factors. We find that for fractionally...