What does "Not Specified (including Confidential) Data" in Coordinated Portfolio Investment Survey (CPIS) mean?

Data reported in the CPIS that are not broken down by the economy of residence of the issuer reflect the lack of information in the CPIS source data or the suppression of entries by individual reporting economies. If the reporting economy is unable to identify the residence of issuer (but has determined that the issuer is nonresident), or if the reported data are deemed confidential, then the data are recorded as “Not Specified (including Confidential) Data”. 

The CPIS dataset can be found here.

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