DOI: 10.9734/ARJOM/2021/v17i330282 Editor(s): (1) Prof. Megan M. Khoshyaran, Economics Traffic Cl... more DOI: 10.9734/ARJOM/2021/v17i330282 Editor(s): (1) Prof. Megan M. Khoshyaran, Economics Traffic Clinic ETC, France. (2) Danilo Costarelli, University of Perugia, Italy. (3) Dr. Nikolaos D. Bagis, Aristotle University of Thessaloniki, Greece. Reviewers: (1) Siwapong Dheera-aumpon, Kasetsart University, Thailand. (2) Pavel Levin, St. John’s University, USA. Complete Peer review History: http://www.sdiarticle4.com/review-history/68132
This work is focused on the modeling of the monthly internally generated revenue of Rivers State ... more This work is focused on the modeling of the monthly internally generated revenue of Rivers State of Nigeria. The particular realization analyzed and herein called RIGR spans from 2007 to 2012. Examination of the series reveals a seasonal nature of annual periodicity. It has a positive outlier in December 2008. Augmented Dickey-Fuller (ADF) Test adjudges RIGR as stationary. However the existence of an outlier invalidates this stationarity claim. Twelve-monthly differencing of RIGR yields the series SDRIGR which may be said to have a generally horizontal trend with an upper spike counterbalanced by a comparably lower one. The correlogram of SDRIGR has significant negative spikes at lag 12 on both the autocorrelation function (ACF) and the partial autocorrelation function (PACF). With these spikes as the only significant ones, the autocorrelation structure is that of a SARIMA(0,0,0)x(1,1,1)12 model; hence its proposal and estimation. However, the residuals of this proposed model are co...
DOI: 10.9734/ARJOM/2021/v17i330282 Editor(s): (1) Prof. Megan M. Khoshyaran, Economics Traffic Cl... more DOI: 10.9734/ARJOM/2021/v17i330282 Editor(s): (1) Prof. Megan M. Khoshyaran, Economics Traffic Clinic ETC, France. (2) Danilo Costarelli, University of Perugia, Italy. (3) Dr. Nikolaos D. Bagis, Aristotle University of Thessaloniki, Greece. Reviewers: (1) Siwapong Dheera-aumpon, Kasetsart University, Thailand. (2) Pavel Levin, St. John’s University, USA. Complete Peer review History: http://www.sdiarticle4.com/review-history/68132
This work is focused on the modeling of the monthly internally generated revenue of Rivers State ... more This work is focused on the modeling of the monthly internally generated revenue of Rivers State of Nigeria. The particular realization analyzed and herein called RIGR spans from 2007 to 2012. Examination of the series reveals a seasonal nature of annual periodicity. It has a positive outlier in December 2008. Augmented Dickey-Fuller (ADF) Test adjudges RIGR as stationary. However the existence of an outlier invalidates this stationarity claim. Twelve-monthly differencing of RIGR yields the series SDRIGR which may be said to have a generally horizontal trend with an upper spike counterbalanced by a comparably lower one. The correlogram of SDRIGR has significant negative spikes at lag 12 on both the autocorrelation function (ACF) and the partial autocorrelation function (PACF). With these spikes as the only significant ones, the autocorrelation structure is that of a SARIMA(0,0,0)x(1,1,1)12 model; hence its proposal and estimation. However, the residuals of this proposed model are co...
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