David Son
This study provides a comprehensive, empirical, and forward-looking examination of legislative and governance indexes in Nigeria from the advent of the Fourth Republic in 1999 through 2025. Nigeria’s democratic journey has attracted sustained scholarly and policy attention, yet many existing studies rely heavily on descriptive analysis or short-term assessments. This research is justified by the need to apply robust time-series econometric techniques, specifically the Seasonal Auto regressive Integrated Moving Average (SARIMA) model, to capture long-run trends, cyclical dynamics, and future trajectories of governance and legislative performance. The study contributes to knowledge by integrating governance indicators with legislative performance proxies and offering policy-relevant forecasts that can inform institutional reform and democratic consolidation.
Abstract
This study analyzes legislative and governance indexes in Nigeria between 1999 and 2025 using a Seasonal Autoregressive Integrated Moving Average (SARIMA) modeling framework. Drawing on secondary data from internationally recognized governance datasets and legislative performance indicators, the study examines historical trends, cyclical movements, and forecast patterns under Nigeria’s Fourth Republic. Findings reveal modest improvements in governance and legislative performance during the early years of democratic rule, followed by prolonged stagnation and periodic decline associated with institutional weaknesses and political instability. SARIMA forecasts indicate that without substantial institutional and policy reforms, Nigeria’s governance outcomes will remain fragile through 2025. The study concludes with policy recommendations focused on legislative capacity building, institutional autonomy, accountability, and data-driven governance reforms.
Keywords
Legislative Index; Governance Index; Nigeria; SARIMA Model; Time Series Analysis; Democratic Governance; Forecasting
1. Introduction
The quality of governance and the effectiveness of legislative institutions are widely recognized as fundamental pillars of democratic stability and socio-economic development. In democratic systems, legislatures play a central role in law-making, representation, oversight, and accountability. Governance indexes, on the other hand, provide systematic tools for evaluating how authority is exercised in the management of public affairs.
Nigeria’s return to democratic governance in 1999, after decades of military rule, marked a significant institutional transition. Expectations were high that democratic institutions, particularly the National Assembly, would strengthen accountability, enhance policy formulation, and promote good governance. However, more than two decades later, governance outcomes remain mixed, with persistent challenges such as corruption, weak institutional capacity, executive dominance, and declining public trust.
This study examines legislative and governance indexes in Nigeria from 1999 to 2025 using a SARIMA-based time-series approach. By combining historical analysis with forecasting, the study provides insights into past performance and likely future trajectories. The objectives of the study are to analyze trends in governance and legislative performance, assess the stability and seasonality of governance indicators, and forecast future outcomes to inform policy and institutional reform.
2. Literature Review
The concept of governance encompasses the processes and institutions through which authority is exercised, decisions are made, and public resources are managed. According to the World Bank, governance includes dimensions such as government effectiveness, rule of law, control of corruption, regulatory quality, political stability, and voice and accountability.Empirical studies on governance in Nigeria have consistently highlighted institutional weaknesses, corruption, and policy inconsistency as major constraints to development. Studies focusing on legislative performance emphasize challenges related to executive dominance, limited oversight capacity, and political interference. While some scholars report modest improvements in legislative professionalism since 1999, others argue that these gains have not translated into substantive governance outcomes.
The application of time-series econometric models in governance research remains limited. SARIMA models have been used in forecasting economic indicators, conflict trends, and public sector performance but are rarely applied to governance and legislative indexes in Nigeria. This study fills this gap by employing SARIMA modeling to analyze long-term patterns and generate forecasts.
3. Methodology
The study adopts a quantitative longitudinal research design using secondary time-series data covering the period 1999 to 2024, with forecasts extending to 2025. Governance data were sourced from internationally recognized datasets such as the Worldwide Governance Indicators, while legislative performance was measured using composite proxies derived from legislative activity, oversight functions, and institutional autonomy.
Governance indicators were normalized on a scale of –2.5 to +2.5, while legislative performance indexes were scaled from 0 to 100. The SARIMA modeling framework was employed to capture both non-seasonal and seasonal dynamics. Model selection was guided by Akaike and Bayesian Information Criteria, and diagnostic tests were conducted to ensure model adequacy.
4. Data Presentation and Analysis
Descriptive analysis indicates that governance indicators improved modestly in the early years of democratic rule, particularly between 1999 and 2007. This period coincided with democratic stabilization and institutional rebuilding. However, from 2008 onward, governance scores stagnated and, in some cases, declined due to political instability, corruption, and weak policy implementation.
Legislative performance followed a similar trajectory. Early improvements in law-making and oversight capacity were observed, but these gains were not sustained. Executive dominance, limited technical capacity, and politicization of legislative processes constrained effectiveness.
Time-series plots reveal cyclical patterns associated with electoral cycles, justifying the use of a seasonal modeling framework.
5. SARIMA Results and Forecasting
Stationarity tests indicated that both governance and legislative series were non-stationary at levels but became stationary after first differencing. Seasonal effects corresponding to electoral cycles were identified.
The selected SARIMA (1,1,1)(1,0,1) model produced satisfactory diagnostics, with residuals exhibiting white noise properties. Forecasts for 2025 suggest marginal improvements in governance and legislative indexes, but the magnitude of change is insufficient to indicate a structural shift in governance quality.
These findings imply that without targeted reforms, Nigeria’s governance trajectory will remain volatile and vulnerable to political shocks.
6. Discussion
The results underscore the limits of democratic transition in the absence of deep institutional reforms. While Nigeria has maintained uninterrupted civilian rule since 1999, governance quality has not improved commensurately. Legislative institutions, though constitutionally empowered, continue to face constraints that undermine their effectiveness.
The SARIMA-based forecasts reinforce the argument that incremental improvements are unlikely to produce transformative governance outcomes. Structural reforms aimed at strengthening legislative autonomy, professionalization, and accountability are essential for sustainable governance improvement.
7. Policy Implications
Policy implications arising from this study include the need to strengthen legislative research and analytical capacity, enhance transparency and oversight mechanisms, and institutionalize data-driven decision-making. Reforms should focus on reducing executive dominance, improving accountability, and fostering public trust in democratic institutions.
8. Conclusion
This study provides a comprehensive assessment of legislative and governance indexes in Nigeria between 1999 and 2025 using a SARIMA-based approach. The findings highlight modest early gains followed by stagnation and volatility. Forecasts indicate that without substantial reforms, governance outcomes will remain fragile. Strengthening legislative institutions is critical for improving democratic governance and development outcomes in Nigeria.
