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An Alternative Class Of Ratio-Regression-Type Estimator Under Two-Phase Sampling Scheme, Muhammad Isah, Zakari Yahaya, Audu Ahmed Dec 2021

An Alternative Class Of Ratio-Regression-Type Estimator Under Two-Phase Sampling Scheme, Muhammad Isah, Zakari Yahaya, Audu Ahmed

CBN Journal of Applied Statistics (JAS)

In this study, a new exponential ratio-regression estimator is developed using an auxiliary variable for estimating the finite population mean under a two-phase sampling system. The Bias and Mean Square Error (MSE) of the proposed estimator are derived and compared with some of the estimators in extant literature. Thus, the conditions under which the proposed estimator is better than some existing estimators are provided. Empirically, using four real datasets and simulation study, the proposed estimator performs better than the classical ratio, classical regression, exponential ratio, and exponential regression cum ratio estimator when compared using the criteria of bias, mean square …


Insurgency, Political Risk, And Foreign Direct Investment Inflows In Nigeria: A Sectorial Analysis, Danjuma Iyaji Dec 2021

Insurgency, Political Risk, And Foreign Direct Investment Inflows In Nigeria: A Sectorial Analysis, Danjuma Iyaji

CBN Journal of Applied Statistics (JAS)

This study examines, among others, the effect of terrorism, political violence, corruption, and religious tension on FDI inflows to the banking, construction, manufacturing, oil and gas, and telecommunication sectors in Nigeria. Thus, empirical models were estimated using the fully modified ordinary least squares (FMOLS) technique. The study spans from 2008Q1 to 2017Q4. Findings show that terrorism adversely affects FDI inflow to telecommunication sector, while corruption positively impacts on the oil and gas sector. Thus, this study among other things, recommends the intensification of effort in the war against terrorism and strengthening of relevant anti-graft agencies to adequately fight corruption in …


Monetary Policy Transmission And Bank Interest Rates In Nigeria, Eleam Victor E., Ekwom Chinyelu G., Ariolu Chibueze C., Umebali Chukwubuzo J., Balogun Adewale T. Dec 2021

Monetary Policy Transmission And Bank Interest Rates In Nigeria, Eleam Victor E., Ekwom Chinyelu G., Ariolu Chibueze C., Umebali Chukwubuzo J., Balogun Adewale T.

CBN Journal of Applied Statistics (JAS)

The paper examines the adjustment of retail and money market interest rates to changes in discount corridor of the monetary policy in Nigeria. A vector error correction model was adopted for this study, using monthly data from 2007:06 to 2019:12. We further accounted for structural breaks in the dataset to improve its policy reliability. The adjustment parameters were found to be significant but with slow speed of adjustment. This finding provides evidence of the weakness of the discount corridor in monetary policy transmission in Nigeria. Furthermore, the results showed no asymmetric adjustment of retail rates to long run equilibria. Lastly, …


Inflations And Its Uncertainty In Some Ecowas Member States: Transfer Entropy Approach, Otoakhia Eric I. Dec 2021

Inflations And Its Uncertainty In Some Ecowas Member States: Transfer Entropy Approach, Otoakhia Eric I.

CBN Journal of Applied Statistics (JAS)

This study examines the information flow between inflation and inflation uncertainty (IU) and intrastate inflationary trend among some ECOWAS member states. IU is measured using GARCH models and stochastic volatility model (SV). Transfer entropy was adopted to quantify the extent of information flow. The result showed information flow exists from inflation to the GARCH measure of IU. On the reverse flow from inflation uncertainty to inflation, there is no information flow except for Burkina Faso and Gambia which have asymmetric bidirectional flow between inflation and IU. Adopting SV measure for IU, there are no support for causality from inflation to …


Relationship Between Real Exchange Rate And Consumption In Nigeria: A Nonlinear Approach, Babangida Jamilu S., Sanusi Aliyu R., Yusuf Isah M. Dec 2021

Relationship Between Real Exchange Rate And Consumption In Nigeria: A Nonlinear Approach, Babangida Jamilu S., Sanusi Aliyu R., Yusuf Isah M.

CBN Journal of Applied Statistics (JAS)

This study analyses the relationship between real exchange rate and domestic consumption in Nigeria using the Smooth Transition Autoregressive (STAR) model from 1981Q1 to 2019Q4. Findings show that domestic consumption determines the regime shift in real exchange rate, suggesting a nonlinear linkage with clearly distinct regimes. The lagged exchange rate is shown to have a significant linear effect on the current exchange rate. On the other hand, current foreign consumption is positive but has no significant impact on the exchange rate in the linear part of the model. In the nonlinear part of the model, evidence of a significant negative …