PDE Research File . This file is an add-on to the industrial files and companies that have been deleted from the active PDE file due to acquisition or merger, bankruptcy, leveraged buyout, or because they became private companies. SAS dataset combines annual files and annual backdata files and thus covers years from 1958 to 1997 . It includes all data from the Primary File, Supplementary File, Tertiary File, Full-Coverage File and Industrial research File. A list of its variables is stored in a file called company.contents in the same directory.
Some variables are period descriptors and company descriptors, and others are data items and notes.
SAS dataset contains the descriptions of the companies listed in the dataset company.ssd01. SAS dataset contains all data in the Industry Segment File and covers years 1991 to 1997 . A list of its variables is stored in file called segment.contents in the same directory. SAS dataset covers years 1978 to 1997 and combines quarterly data from the Primary File, Supplementary File, Tertiary File, Full-Coverage File and Industrial research File. A list of its variables is stored in a file called company.contents in the same directory.