The government is back. Government data, however, will have to wait awhile.

The partial government shutdown left forecasters, investors and policymakers without much of the data they rely on — just as concerns were mounting that the United States’ decade-long economic expansion could be nearing its end.

Now that the monthlong shutdown is over, it will take government statisticians time to collect and analyze delayed figures for retail sales, manufacturing, housing and other parts of the economy. On Monday, the Commerce Department said it would not be able to release an estimate of gross domestic product for the fourth quarter that had been scheduled for Wednesday.

That means that when officials gather Tuesday and Wednesday for a meeting of the Federal Reserve’s policymaking group, the Federal Open Market Committee, they will do so without access to much of the information they usually have. The timing is awkward: Fed officials have emphasized in recent months that with the economy’s direction uncertain, they will be paying particularly close attention to the latest data when making decisions on interest rates and related matters.

“The F.O.M.C. have told us that policy has become increasingly data dependent, but what data?” said Joel Prakken, chief United States economist for Macroeconomic Advisers, a forecasting firm.