BLS's estimates of quarterly labor productivity, output per hour worked, are revised because
of revisions to source data. Early estimates of hours worked and output are subject to
substantial revisions for a variety of reasons. The BLS productivity program produces three
regularly scheduled estimates of labor productivity growth: the preliminary estimate, the first
revised estimate, and the second revised estimate. We consider revisions to the preliminary
and first revised estimate relative to the second revised estimate. Our goal is to develop …

Excessive infant crying and later behaviour problems: Findings of the bavarian longitudinal
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