What is the difference between Non-Manufacturing Index, NMI and Service PMI?

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The survey scope of Non-Manufacturing Index, NMI, in addition to service sector, also includes construction, power and gas supply, water supply and pollution remediation industries. The two sectors differ in industry categories covered in the surveys. In addition, Taiwan NMI is in accordance with the U.S. ISM practices, which is calculated using the weighted average of four diffusion indexes. However, some countries directly use business activity index as the service PMI.

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