In: Economics
NIPA data
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 are revised many times.  | 
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 are never revised.  | 
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 are revised once.  | 
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| 
 are revised twice.  | 
Are revised many times
NIPA stands for National Income and Product Account.
The NIPA data are revised once a year. This revision is done in
summer and cover all the quarters. So, for lifetime, the revision
is done many times.