Why do the jobs numbers get revised?

our markets and policymakers want data NOW but employer data dribbles in over months

1st estimate is based on the 75% of employers who respond promptly

Updates occur as more data rolls in: 95% response rate by final revision 1/N

www.bls.gov/opub/btn/vol...

The initial estimate of job change for a month is based on the growth or loss of jobs at the businesses that have reported their data. Generally, BLS assumes that the employment situation at businesses that had reported is representative of the situation at those that had not yet reported. BLS continues to collect outstanding reports from the
businesses in the sample as it prepares a second and then a third estimate for the month. With each subsequent estimate, more businesses have provided their information. In 2012, the average collection rate at the time of the third estimate for a month was 94.6 percent. (See chart 1.)
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plus, in boom times, the slowest reporters are probably those who are sesperately hiring to keep up. So we revise upwards. And in recession, the ones late to report just laid off people so they have no capacity for reporting. So we revised downward.

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