WASHINGTON (Bloomberg) - A Google search or a tweet about a job is part of a vast trove of private economic information that might help Federal Reserve chairman Janet Yellen and her colleagues get a more complete picture of where the US economy is headed.

Economists at the Fed are looking into whether non- traditional data could improve the accuracy and timeliness of the forecasts they put before monetary-policy decision makers about every six weeks. First, though, they want to be satisfied about the quality and reliability of the information.

The project comes as digital information about the economy is exploding. Companies post billions of prices online for everything from milk to haircuts, and households query Google's search engine for the best mortgage rates or car deals. Retailers also collect billions of pieces of information about consumer preferences by capturing data every time a customer swipes a membership card at a grocery store or shops online.

For Fed economists, "the aspiration is to be sure we are aggressively pushing the envelope in putting in front of policy makers as accurate a picture of the economy as best as we can understand it," David Wilcox, director of the Fed Board of Governors' Division of Research and Statistics, said in a Feb. 10 interview.

Current forecasting methods have their shortcomings. The economy is constantly shifting, eluding economic models that assume fairly predictable responses to low interest rates or low gasoline prices. Turning points are notoriously hard for forecasters to identify.

And government statistical information is often stale. When Fed officials meet next week, for example, the most recent report on their preferred inflation index will be from January.

Data the Fed collects itself, or uses from private sources, is routinely "anonymized." The New York Fed, for example, produces a household debt and credit report from a national sample drawn from anonymous Equifax credit data.

Fed officials don't foresee private-sector data replacing their use of U.S. government statistics on everything from inflation to how workers flow in and out of the labor force.

The goal is to shorten "the time lag between what is happening and what your understanding of that is," said David Stockton, the Fed's former chief forecaster who is now a senior fellow at the Peterson Institute for International Economics in Washington.

Fed economists are reviewing research papers by Google chief economist Hal Varian on how search terms can be useful as spending indicators, and work by University of Michigan computer scientists and economists who have built a labor-market indicator from social media posts.

Also under review are labor market data produced by human resources company ADP Research Institute and Massachusetts Institute of Technology's Billion Prices Project, which collects online data from retailers. An associated company, called Price Stats, produces daily, monthly and annual price indexes.

Fed officials also intend to review research that suggests an estimate of gross domestic product can be constructed from the financial statements of the largest U.S. companies.

"There is a lot of data out there that could be very valuable in trying to understand what is happening in the economy in the real time," said Mark Zandi, chief economist at Moody's Analytics Inc. which is assisting ADP's research unit with studies of its data on 24 million employees, whose names are kept confidential.

Zandi calls ADP's information a "treasure trove" that can shed light on labor market puzzles such as why wage growth has been stagnant. One answer Moody's has seen in the ADP data: a lot of the new entrants in the labor force are younger, lower-paid workers.

The Fed isn't the only central bank interested in what the Internet can tell it about the economy. Central banks from Israel to the United Kingdom are all looking at ways large data sets can give them an edge.

Bank of England Chief Economist Andrew Haldane said that in the run-up to the Scottish independence referendum last year the central bank was concerned about possible deposit outflows from financial institutions.

So the Bank of England set up a word tracker to monitor tweets that referenced banks and words like "run," "panic" and "referenda."

"This system could not have been put in place as recently as five years ago," said Haldane, at a Bank of England seminar on Feb. 25. "We are reasonably in the early throes of what is genuinely a revolution" in data.