The ADP national employment report is computed from a subset of ADP records that in the last six months of 2006, represented approximately 364,000 U.S. business clients and approximately 22 million U.S. employees working in all private industrial sectors. The data are collected for pay periods that can be interpolated to include the week of the 12th of each month, and processed with statistical methodologies similar to those used by the U.S. Bureau of Labor Statistics to compute employment from its monthly survey of establishments. ADP contracted with Macroeconomic Advisors to compute a monthly report that would ultimately help to predict monthly nonfarm payrolls from the Bureau of Labor Statistic's employment situation. The ADP report only covers private (excluding government) payrolls at this time
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