Revisions to Prior Jobs Report

It’s common for the Gov to revise the jobs report numbers for the prior couple of months when issuing a new monthly report. One thing I’ve noticed is that these revisions seem to virtually always be in the same direction as the current report. Meaning that if the current report is positive and better than expected etc., it will generally be accompanied by an upwards revision of the reports for the previous month or two. And the reverse if the current report is negative.

Why should this be so?

WAG: In absence of complete data, they go for conservative estimates along the observed trend.