Series Is Presented Here As Two Seasonally Adjusted Variables--(1)--1919-April 1940 (2)--1939-April 1944. The Two Variables Are Not Comparable. The First Was Seasonally Adjusted By The Federal Reserve Bank Of N.Y. And Then Adjusted For Trend And Price Changes. The Second Variable Consists Of Federal Reserve Board Seasonally Adjusted Indexes Corrected For Trend And Price Changes. The Trend Correction Of The Two Variables Is Different; The Deflator Is The Same For 1939, Different For The First Four Months Of 1940. The Second Variable Was Never Computed Back Of 1939. Source: Federal Reserve Bank Of New York, Domestic Research Department
This NBER data series m06002a2 appears on the NBER website in Chapter 6 at http://www.nber.org/databases/macrohistory/contents/chapter06.html.
NBER Indicator: m06002a2
Release: NBER Macrohistory Database
National Bureau of Economic Research, Department Store Sales, Adjusted For Trend for United States [M062A2USM363SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M062A2USM363SNBR/, November 25, 2015.