1925 historical Indexes
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An overview of the development history of CRSP's index files and descriptions of the index types that are available.
|Index Definitions & Calculations
Calculations and definitions that are used in or are useful for understanding the CRSP 1925 Historical Indexes are included in this section.
CRSP Index Database variables by category. Includes Item IDs, descriptions, and headers.
File specifications and detailed information on accessing and using them.
Tables listing the CRSP Index Series by INDNO, Index Groups, and Portfolio Indexes.
Index Data Availability
CRSP Indexes-only subscribers have access to the stand-alone version of the index files, including ASCII, Excel, and SAS formats.
CRSP Stock & Index subscribers may access the stand-alone files in addition to accessing Stock File Indexes, their decile level statistics and portfolio assignments through CRSPSift and CRSPAccess utilities. Available through CRSP utilities is an additional index, the NYSE/AMEX Trade-Only Value-Weighted Index.
CRSP Stock Database-only subscribers have access to the CRSP NYSE/AMEX/NASDAQ/ARCA Equal- and Value-Weighted Indexes, the S&P 500 Composite, and the NASDAQ Composite.
Data Accuracy and the CRSP Indexes
CRSP data files are designed for research and educational use and have proven to be highly accurate. Considerable resources are expended on improving and assuring data quality.
The 2006 addition of the pre-1962 daily stock data to the CRSP databases provided a new level of granularity. Information provided through the addition of the daily prices enabled CRSP to clean up distribution information and security trading date ranges. Changes were introduced in phases with annual shipments to our subscribers over three years, the last being the 2007 data cut that shipped in early 2008. Included in each of these shipments were two cuts of the databases, pre- and post-revisions. While CRSP felt that the differences between the two data cuts and the impact on indexes was insignificant, it was important to provide all data so that subscribers had full control over comparing differences and in determining which data cuts were appropriate for their uses.
Throughout each year, CRSP makes edits to the stock files, which may result in slight changes to the historical values of indexes derived from the stock databases. In the event that CRSP determines that changes are material, we will advise subscribers, produce, and ship pre- and post-revision cuts of the data.