A closely watched report often criticized for sending out misleading signals about the state of the labor market is undergoing a major overhaul.

On Wednesday, payroll processing giant ADP announced that it was shifting from Macroeconomic Advisers to Moody's Analytics as its partner to compile its monthly report on the state of private-sector hiring. The new methodology kicks in with the release of the next report on October hiring activity, due on Nov. 1.

As it was since the report's beginning in 2006, the ADP release will aim to get to the actual state of the private labor market. The monthly government payroll data tends to undergo significant revisions that can often leave the state of the labor market looking notably different in its final version from how it was first reported.

The ADP data is intended to reveal where the government data is heading when finalized. But financial markets often looked to the report as an immediate proxy for the government report. The frequent disconnect between ADP and the first reporting of government numbers has drawn steady criticism from market participants.

The ADP report "has performed quite well over the last six years" given what it was intended to capture, said Jan Siegmund, chief strategy officer with ADP. He said his company's relationship with Macroeconomic Advisers ended "very amicably" and "we have no bad feelings' about the company.

In changing horses, Mr. Siegmund said Moody's is "a very good match for our expectations."

The improved ADP report also hopes to reveal where a given monthly job count will be revised to, and to that end, it is employing a broader set of measurements. Mark Zandi, chief economist of Moody's Analytics, said the report aims to be closest to the "truth" of where the labor market is in a given month.

Mr. Zandi said the report now looks at five business class sizes instead of three, and measures hiring at a company level. ADP noted it will now sample 406,000 companies, from 344,000, with employees accounting for more than 20% of the private sector labor force. The company claims the new methodology shows a 96% correlation with revised government data going back to 2001.

As it was before, the monthly ADP job count is not necessarily trying to catch the first print of jobs data from the Bureau of Labor Statistics. That could open the report up to the same charges the report is giving a misleading picture on job growth.

Mr. Zandi said "I'm hopeful market participants will be able to look through the initial number" and through "learning by experience" they will see the insight the ADP report is trying to provide.

Macroeconomic Advisers was not available to comment on the changes.

Write to Michael S. Derby at Michael.derby@dowjones.com

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