This Index Is Based On Reports Of Purchasing Agents On Changes In New Orders From The Previous Month. The Index Covers Forty-Two Industries In All States, Excepting New Mexico And Montana. The 225 Companies Is An Approximation. Source: NBER And National Association Of Purchasing Agents
This NBER data series m16087a appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: m16087a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Diffusion Index, New Orders, 225 Companies, One Month Span for United States [M1687AUSM509NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M1687AUSM509NNBR/, July 6, 2015.