set more off

/**********************************************************************

THIS IS AN EXAMPLE OF A PROGRAM THAT CAN BE USED TO READ IN THE 
LINKED NHIS-HUD AND NHANES-HUD FEASIBILITY STUDY ASCII FILES. 

TO DOWNLOAD AND SAVE THE LINKED NCHS-HUD FEASIBILITY STUDY
ASCII FILE TO YOUR HARD DRIVE, FOLLOW THESE STEPS:

*STEP 1: DESIGNATE A FOLDER ON YOUR HARD DRIVE TO DOWNLOAD THE LINKED
         NHIS-HUD AND NHANES-HUD FEASIBILITY STUDY ASCII FILES. 
         IN THIS EXAMPLE, THE DATA WILL BE SAVED IN:
        'C:\Feasibility Study Data\'

*STEP 2: DOWNLOAD THE ASCII DATA FROM THE NCHS WEB SITE.
         GO TO THE NCHS WEB SITE (LINK BELOW) AND DOWNLOAD THE LINKED
         NHIS-HUD AND NHANES-HUD FEASIBILITY STUDY ASCII FILES TO THE FOLDER
        'C:\Feasibility Study Data\'


ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/datalinkage/hud/HUD_FEASIBILITY_NHIS.ascii
ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/datalinkage/hud/HUD_FEASIBILITY_NHANES.ascii


NOTES:

THIS PROGRAM ASSUMES THAT THE ASCII DATA FILE IS IN STATA'S WORKING
DIRECTORY.  AN EXAMPLE OF HOW TO CHANGE THE WORKING DIRECTORY 
WITHIN STATA IS THE FOLLOWING COMMAND: cd "C:\Feasibility Study Data\"


*IMPORTANT INFORMATION REGARDING THE SURVEY ID VARIABLE:

FOR NHIS USE PUBLICID AS THE ID VARIABLE   
FOR NHANES USE SEQN AS THE ID VARIABLE  

*********************************************************************/
# delimit ;

/* CHANGE WORKING DIRECTORY TO FIND FILE */
cd "C:\Feasibility Study Data\";


/*TO READ IN THE LINKED NHIS-HUD FEASIBILITY STUDY ASCII FILE */

/* INPUT ALL NEW VARIABLES */
infix 
str publicid	       	1-14 
str survey_name         16-31
hud_match_status        40 
ever_hcv                42 
ever_hud                44 
ever_mf                 46 
ever_ph                 48 
using hud_feasibility_nhis.ascii, clear
;

/* DEFINE VARIABLE LABELS */
label variable publicid           "NHIS PUBLIC ID";
label variable survey_name        "SURVEY NAME";
label variable hud_match_status   "NCHS-HUD MATCH STATUS";
label variable ever_hcv           "EVER LINKED TO HCV";
label variable ever_hud           "EVER LINKED TO HUD";
label variable ever_mf            "EVER LINKED TO MF";
label variable ever_ph            "EVER LINKED TO PH";

/* DISPLAY OVERALL DESCRIPTION OF FILE */
describe;
codebook,all;

/* DATA FILE IS STORED IN FEASIBILITY.DTA */
save feasibility_nhis.dta, replace;


***********************************************************************************;
/*TO READ IN THE LINKED NHANES-HUD FEASIBILITY STUDY ASCII FILE */


#delimit ;

/* INPUT ALL NEW VARIABLES */
infix 
seqn	     	       	1-15 
str survey_name         16-31
hud_match_status        40 
ever_hcv                42 
ever_hud                44 
ever_mf                 46 
ever_ph                 48 
using hud_feasibility_nhanes.ascii, clear
;

/* DEFINE VARIABLE LABELS */
label variable seqn               "NHANES SEQUENCE NUMBER";
label variable survey_name        "SURVEY NAME";
label variable hud_match_status   "NCHS-HUD MATCH STATUS";
label variable ever_hcv           "EVER LINKED TO HCV";
label variable ever_hud           "EVER LINKED TO HUD";
label variable ever_mf            "EVER LINKED TO MF";
label variable ever_ph            "EVER LINKED TO PH";

/* FORMAT ZERO FILL ID VARIABLE (SEQN) */
format seqn %05.0f; 

/* DISPLAY OVERALL DESCRIPTION OF FILE */
describe;
codebook,all;

/* DATA FILE IS STORED IN FEASIBILITY.DTA */
save feasibility_nhanes.dta, replace;

#delimit cr