Forecasting Key Macroeconomic Indicators in Ghana Using a Time-Varying VECM with Conformal Prediction Intervals

Authors

  • Chinton Emmanuel Department of Statistics, University of Cape Coast, Ghana
  • Donkoh Kojo Isaac Financial Engineering, WorldQuant University,, USA
  • Acquah Oware Nana Emmanuel Department of Economics and Finance, Youngstown State University, USA

DOI:

https://doi.org/10.54536/ajase.v4i1.5752

Keywords:

Conformal Prediction, Exchange Rate Forecasting, Ghana, Inflation, Monetary Policy, Time-Varying VECM

Abstract

This paper presents a six-month-ahead forecast of three key Ghanaian macroeconomic indicators: the USD/GHS exchange rate, the Consumer Price Index (CPI) and the Monetary Policy Rate (MPR). A Time-Varying Vector Error Correction Model (TV-VECM) is utilized to capture dynamic interrelationships among the variables. Conformal prediction intervals are incorporated to quantify uncertainty under minimal distributional assumptions. The results suggest moderate currency depreciation, persistent inflationary trends and stability in nominal interest rates over the forecast horizon.

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References

Angelopoulos, A. N., Candès, E., & Tibshirani, R. J. (2023). Conformal PID Control for Time Series Prediction. (Online CP that adapts to trend/seasonality).

Bierens, H. J., & Martins, L. F. (2010). Time-Varying Cointegration. Cambridge/ET. (Smoothly time-varying cointegration, LR test).

Eroğlu, B. A., Miller, J. I., & Yiğit, T. (2022). Time-varying cointegration and the Kalman filter. Econometric reviews, 41(1), 1-21.

Gao, J., Peng, B., & Yan, Y. (2023/2025). Time-Varying Vector Error-Correction Models: Estimation and Inference. (TV-VECM theory and methods).

Gibbs, I. & Candès, E. (2021/2024). Adaptive Conformal Inference under Distribution Shift. (Online CP with distribution shift). Journal of Machine Learning Research

Hallberg-Szabadváry, J. (2024). Adaptive CI for Multi-Step TS (Online). (H-step CP with guarantees).

Hansen & Seo; Smooth/Threshold VECM (overview).

KDI Journal (2021). Time-varying Cointegration Models and Exchange Rate (PPP and monetary models pass when allowing time-variation). KDI Journal of Economic Policy

Kopetzki, S. (2025). Conformal multistep-ahead multivariate TS forecasting. (Joint multivariate intervals).

Reuters (2025). Ghana policy rate moves (hike; record cut) in 2025. (Motivation for time-variation)

Stankevičiūtė, G. (2021). Conformal Time-Series Forecasting. (Multi-horizon CP for TS).

Xu, C., & Xie, Y. (2021). Conformal Prediction Interval for Dynamic Time-Series (EnbPI). (Ensemble CP under dependence).

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Published

2025-09-29

How to Cite

Chinton, E., Isaac, D. K., & Nana Oware Acquah, E. (2025). Forecasting Key Macroeconomic Indicators in Ghana Using a Time-Varying VECM with Conformal Prediction Intervals. American Journal of Applied Statistics and Economics, 4(1), 108–111. https://doi.org/10.54536/ajase.v4i1.5752