Injury Data and Resources
Instructions: Step-by-Step Guide to
Accessing NHAMCS-ED
Public Use Data Files and Programs to Select Injury Records and
Calculate Visit Rates
SAS and SUDAAN Programs for Variance Estimation
Sample SAS and SUDAAN codes and documentation for variance estimation of complete NHAMCS-ED data.
- Sample Codes for 2002-05
- Sample Codes for 1993-2001
-
More information about NHAMCS variance
estimation: also read "Using Ultimate Cluster Models with NAMCS and
NHAMCS Public Use Files"
Sample Codes for 2002-05
- PROC SORT DATA=xxx; /* replace xxx with the name that you want to use for your SAS dataset */
- BY CSTRATM CPSUM;
- PROC CROSSTAB DATA=xxx DESIGN=WR FILETYPE=SAS;
- NEST CSTRATM CPSUM/MISSUNIT;
- WEIGHT PATWT;
- CLASS SEX; /* replace SEX with the variable that you would like to use */
- TABLES SEX; /* replace SEX with the variable that you would like to use */
- PRINT /STYLE=NCHS;
- RUN;
Sample Codes for 1993-2001
Step 1
Since the two variables, “CSTRATM” & “CPSUM”, for variance estimation is not included in data files before 2002. The following program is needed to calculate them from existing variables from the public use data file. This code needs to be included in a SAS data step.
- CSTRATM=STRATM;
- CPSUM=PSUM;
- IF CPSUM IN (1 2 3 4) THEN DO;
- CSTRATM=(STRATM*100000)+(1000*(MOD(YEAR,100)))+
- (SUBFILE*100)+PROSTRAT;
- CPSUM=PROVIDER+100000;
- END;
- ELSE CSTRATM=(STRATM*100000);
Step 2
Sample SAS and SUDAAN codes for variance estimation
- PROC SORT DATA=xxx; /* replace xxx with the name that you want to use for your SAS dataset */
- BY CSTRATM CPSUM;
- PROC CROSSTAB DATA=xxx DESIGN=WR FILETYPE=SAS;
- NEST CSTRATM CPSUM/MISSUNIT;
- WEIGHT PATWT;
- CLASS SEX; /* replace SEX with the variable that you would like to use */
- TABLES SEX; /* replace SEX with the variable that you would like to use */
- PRINT /STYLE=NCHS;
- RUN;
Page Last Modified: October 15, 2008
- NCHS Home
- Deaths: Injuries, 2002
- Document on Injury Severity Measurement
- National Trends in Injury Hospitalization Chartbook
- FASTSTATS A-Z
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