What Is the Index of Coincident Economic Indicators?

The Index of Coincident Economic Indicators (ICEI) is a composite measure designed to reflect the current state of an economy. It captures data series that tend to move in line with the overall economy, providing a snapshot of real-time economic activity. Developed and maintained by institutions such as The Conference Board in the United States, the ICEI is frequently used by economists, analysts, and policymakers to validate turning points in business cycles and assess whether the economy is expanding or contracting.

Purpose and Function

Unlike leading indicators, which are designed to predict future movements in the economy, coincident indicators move synchronously with the economic cycle. Their primary role is to confirm current economic conditions. The ICEI aggregates several key economic variables, making it more comprehensive than any single indicator. Because of its design, it is especially useful for identifying peaks and troughs in economic activity when used in conjunction with other indexes.

The ICEI is commonly used by business economists to track the present pace of growth and to validate the direction of the economy as shown by leading indicators. It also assists in developing macroeconomic models and forecasting tools that rely on accurate current-state assessments.

Components of the Index

The exact components of the ICEI can vary by country, but in the United States, the index typically includes four key data series:

1. Nonfarm Payroll Employment – Tracks the number of paid workers in the U.S. economy, excluding farm workers and a few other job categories. This is a direct reflection of labor market strength.
2. Personal Income (excluding transfer payments) – Measures household income from employment and business activities, offering a view of consumer purchasing power.
3. Industrial Production – Represents output in manufacturing, mining, and utilities. This is a proxy for business activity in the production sector.
4. Manufacturing and Trade Sales – Aggregates sales figures from manufacturing, wholesale, and retail sectors, signaling demand in goods and services.

These components are selected because of their alignment with the broader economy and their ability to track economic movements in real time. Each series is seasonally adjusted, weighted, and indexed to produce a standardized composite value.

Methodology

The ICEI is calculated by standardizing each component to remove differences in units and volatility. These standardized values are then combined using fixed weights that reflect their relative importance to the economy. The index is re-based periodically, often to a specific year (e.g., 2016 = 100), to maintain comparability over time.

Smoothing techniques, such as three-month moving averages, are applied to the composite to reduce noise and isolate the underlying economic trend. This ensures the index remains stable and reflective of real shifts in economic activity, rather than short-term volatility.

The Conference Board also applies a process called "trend adjustment" to remove long-term growth trends, allowing the index to focus on cyclical movements rather than structural economic changes.

Use in Economic Analysis

The ICEI is part of a broader framework of business cycle analysis. It is often presented alongside the Leading Economic Index (LEI) and Lagging Economic Index (LAG). While the LEI attempts to anticipate changes in the economy and the LAG confirms trends after they occur, the ICEI occupies the middle ground by validating current economic trends.

Economists use the ICEI to:

• Confirm the direction and pace of economic growth
• Support or refute signals provided by leading indicators
• Identify the current phase of the business cycle (expansion, peak, contraction, trough)

For instance, a sustained increase in the ICEI would confirm an expansionary phase, while a plateau or decline could indicate a slowdown or contraction. Because it responds to actual economic activity, the ICEI tends to be more stable and less prone to revisions than leading indicators.

Limitations

Although the ICEI is valuable for real-time analysis, it is not predictive. It cannot anticipate turning points in the economy, and it is subject to revision as new data is released. Moreover, because the components are based on historical records, the index may lag slightly behind the release of real-world events.

Another limitation is that the ICEI may not fully capture structural shifts in the economy, such as the transition to a more service-based or digital economy. Components like manufacturing and industrial production may decline in relevance over time relative to other sectors.

The Bottom Line

The Index of Coincident Economic Indicators is a crucial tool for measuring the current state of the economy. By combining employment, income, production, and sales data, the ICEI provides a balanced view of real-time economic activity. It helps confirm trends and contextualize other economic signals but should be used in conjunction with leading and lagging indicators for a complete understanding of business cycle dynamics.