This Index Was Computed By NBER From Original Data In Thousands Of Pounds Sterling Published In Bankers' Magazine. Additions To Or Subtractions From The Number Of Securities Included Have Been Made From Time To Time. Data From The Old And New Series Were Linked By The NBER And The Resultant Index Is Constructed Based Upon The 1913 Average. At The Points Of These Revisions In The Series The Value For The Given Date According To Both The Old And The New Data Were Available. By Multiplying Data From One Period By A Coefficient Equal To The Ratio Of The Old To The New, A Single Series Was Constructed, Including The Data From Both Original Sections. Consequently, The Various Sections Of Original Data Have Been Tied Together At Their Overlapping Points. The Time Periods Used By NBER Are April, 1887-June, 1891; June, 1891-December, 1895; December, 1895-December, 1906; December, 1906-December, 1921; December, 1921-December, 1922; December, 1922-1939. Source: Bankers' Magazine, London And Computed By NBER.
This NBER data series m11022 appears on the NBER website in Chapter 11 at http://www.nber.org/databases/macrohistory/contents/chapter11.html.
NBER Indicator: m11022
Release: NBER Macrohistory Database
National Bureau of Economic Research, Security Price Index for London, Great Britain [M11022GB00LONM324NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M11022GB00LONM324NNBR/, October 3, 2015.