Missing Values |
In general, CRSP missing values are represented as ‘.’ in the SAS data set. When accessing the CCM database, SASEXCCM interprets missing values according to the conditions and codes defined by Compustat, and represents them as SAS missing codes, as shown in Table 39.3.
Missing Value |
Missing Code |
Condition |
---|---|---|
0.0001 |
. |
No data for data item |
0.0002 |
.S |
Data is only on a semi-annual basis |
0.0003 |
.A |
Data is only on an annual basis |
0.0004 |
.C |
Combined into other item |
0.0007 |
.N |
Data is not meaningful |
0.0008 |
.I |
Reported as insignificant |
Missing value codes conform with Compustat’s Strategic Insight and binary conventions for missing values. See the section "Notes on Missing Values" in the second chapter of the CRSP/Compustat Merged Database Guide for more information about how CRSP handles Compustat missing codes.
Note: This procedure is experimental.