The DATASOURCE Procedure

This sample code reads all the data on a three-volume daily NYSE/AMEX combined character data set. Assume that the following filerefs are assigned to the calendar/indices file and security files that this database comprises:

Fileref	VOLSER	File Type
calfile	DXAA1	calendar/indices file on volume 1
secfile1	DXAA1	security file on volume 1
secfile2	DXAA2	security file on volume 2
secfile3	DXAA3	security file on volume 3

The data set CALDATA is created by the following statements to contain the calendar/indices file:

proc datasource filetype=crspdci infile=calfile out=caldata;
run;

Here the FILETYPE=CRSPDCI indicates that you are reading a character format (indicated by a C in the 6th position) daily (indicated by a D in the 5th position) calendar/indices file (indicated by an I in the 7th position).

The annual data in security files can be obtained by the following statements:

proc datasource filetype=crspdca
                infile=( secfile1 secfile2 secfile3 )
                out=annual;
run;

Similarly, the data sets to contain the daily security data (the OUT= data set) and the event data (the OUTEVENT= data set) are obtained by the following statements:

proc datasource filetype=crspdcs
                infile=( calfile secfile1 secfile2 secfile3 )
                out=periodic index outevent=events;
run;

Note that the FILETYPE= has an S in the 7th position, since you are reading the security files. Also, the INFILE= option first expects the fileref of the calendar/indices file since the dating variable (CALDT) is contained in that file. Following the fileref of calendar/indices file, you give the list of security files in the order in which you want to read them. When data span more than one physical volume, the filerefs of the security files residing on each volume must be given following the fileref of the calendar/indices file. The DATASOURCE procedure reads each of these files in the order in which they are specified. Therefore, you can request that all three volumes be mounted to the same drive, if you choose to do so.

This sample code illustrates the following points:

By default, the OUT= data set contains only the periodic data. However, you may also want to include the event-oriented data in the OUT= data set. This is accomplished by listing the event variables together with periodic variables in a KEEP statement. For example, if you want to extract the historical CUSIP (NCUSIP), number of shares outstanding (SHROUT), and dividend cash amount (DIVAMT) together with all the periodic series, use the following statements.

proc datasource filetype=crspdcs
                infile=( calfile secfile1 secfile2 secfile3 )
                out=both outevent=events;
   where cusip='09523220';
   keep  bidlo askhi prc vol ret sxret bxret ncusip shrout divamt;
run;

The KEEP statement has no effect on the event variables output to the OUTEVENT= data set. If you want to extract only a subset of event variables, you need to use the KEEPEVENT statement. For example, the following sample code outputs only NCUSIP and SHROUT to the OUTEVENT= data set for CUSIP=’09523220’:

proc datasource filetype=crspdxc
                infile=( calfile secfile)
                outevent=subevts;
   where cusip='09523220';
   keepevent  ncusip shrout;
run;

Output 12.9.1, Output 12.9.2, Output 12.9.3, and Output 12.9.4 show how to read the CRSP Daily NYSE/AMEX Combined ASCII Character Files.

filename dxci "%sysget(DATASRC_DATA)dxccal95.dat" RECFM=F LRECL=130;
filename dxc "%sysget(DATASRC_DATA)dxcsub95.dat" RECFM=F LRECL=400;

/*--- create output data sets from character format DX files ---*/
/*- create securities output data sets using DATASOURCE  -------*/
/*- statements                                                 -*/
proc datasource filetype=crspdcs  ascii
                infile=( dxci dxc )
                interval=day
                outcont=dxccont
                outkey=dxckey
                outall=dxcall
                out=dxc
                outevent=dxcevent
                outselect=off;
   range from '15aug95'd to '28aug95'd ;
   where cusip in ('12709510','35614220');
run;

title1 'Date Range 15aug95-28aug95 ';

title3 'DX Security File Outputs';
title4 'OUTKEY= Data Set';
proc print data=dxckey;
run;

title4 'OUTCONT= Data Set';
proc print data=dxccont;
run;

title4 "Listing of OUT= Data Set for cusip in ('12709510','35614220')";
proc print data=dxc;
run;

title4 "Listing of OUTEVENT= Data Set for cusip in ('12709510','35614220')";
proc print data=dxcevent;
run;

Note in Output 12.9.4 that there were no events in range for cusip 35614220. See Chapter 38: The SASECRSP Interface Engine, for more on CRSPAccess Data access.