"Synchronous Index (Synchronous Index) is an economic indicator used to measure the degree of synchronization of global economic activities. It is usually formulated by international financial institutions, research institutions or consulting companies to reflect the synchronization of global economic cycles.

The Coincidence Index is calculated by collecting and analyzing economic data for various countries or regions around the world. These data include gross domestic product (GDP), employment, inflation, exports, imports, and more. The Synchronization Index combines these data to provide a more complete picture of how synchronized global economic activity is.

The calculation method of the coincidence index usually involves complex economic models and statistical methods. Specifically, it usually uses the method of calculating covariance and correlation coefficient to measure the degree of connection between economic activities in different countries or regions. This more accurately reflects the synchronicity of the global economy, allowing for a better understanding of global economic trends and risks.

Synchronous index is of great significance to the government, enterprises and investors. First, it can help governments and enterprises better grasp global economic trends to formulate more scientific and effective policies and strategies. Second, it can help investors better understand global economic risks so that they can allocate asset portfolios more accurately and reduce investment risks.

It should be noted that the coincidence index is not a panacea economic indicator. Its assessment results are not necessarily universal. Therefore, when using the synchronization index, it is necessary to consider factors such as its compilation process, data sources, and economic models, and combine factors such as specific national conditions, development stages, and goals to formulate more scientific and reasonable strategies and policies. "