It was those monthly survey numbers that Walker's op ponents have used since last year to criticize him.
The accuracy of the monthly data has been called into question in the past. The monthly estimates, after all, are based on surveys of only 3.5% to 5% of the state's businesses each month and then extrapolated statewide under a mathematical model that's routinely prone to error.
But the inaccuracies were never shown on a scale of 57,200 in a single year.
Inaccurate data
And it brings up an issue that's been reported, but is often overlooked or willfully ignored: The state employment data that triggers each month's partisan eruption is prone to stunning degrees of inaccuracy. It's a fact that even government statisticians don't talk about unless asked. But the common margin of error would astonish anyone who assumes that Wisconsin's monthly unemployment reports are a reliable reflection of the Badger State economy.
An example: On any given month, the margin of error for the net change in Wisconsin employment can be off by 9,340 jobs in either direction, according to the U.S. Bureau of Labor Statistics, which compiles the figures for the nation and each of the 50 states.
Using the most recent monthly data - in March, when the data reported an estimated loss of 4,500 jobs in the state - that could either mean a dispiriting loss of 13,840 jobs or a respectable gain of 4,840.
And that range of standard deviations, as the discrepancies are known to the green-eyeshade crowd, is only to achieve a 90% degree of confidence in the numbers. "Ten percent of the time, it's outside of those bounds," meaning they are even more wildly erratic, said Kenneth Robertson, chief of the division of Current Employment Statistics at the Bureau of Labor Statistics.