************************************************************
* Program:  C:\NHANES\LabelFormat.sas                      *
* Proposal: Label and format dervied variables             *
************************************************************;

libname lib "C:\your_dir";

/*change the name of the directory folder to the location that you saved your downloaded dataset
 from the sample code and dataset downloads module: for example "c:\nhanes\datasets"*/

/*see program AppendMerge_RegroupRecode.sas*/

/*User defined format*/
proc format;
	value yesno 1='Yes'
	            2='No';
	value age   1='Age 20-39'
		        2='Age 40-59'
			    3='Age 60+';
	value race  1='NH white'
		        2='NH black'
			    3='Mexican American'
			    4='Other race/ethn';
run;

/*Assign user defined format to derived variables, label new variable*/ 
data demo_BP4;
	set lib.demo_BP3;
	format age3cat age. 
           raceth race. 
           SBP140 DBP90 HBP_trt HBP HLP_lab HLP_trt HLP yesno.;
	label  age3cat='Age 3 categories'
		   raceth='Race/ethn 4 categories'
		   mean_SBP='Mean of SBP'
		   mean_DBP='Mean of DBP'
		   SBP140='SBP>=140 mmHg'
		   DBP90='DBP>=90 mmHg'
		   HBP_trt='Hypertension treatment'		  
		   HBP='Hypertension'
           HLP_lab='Cholesterol>=240 mg/dl'
		   HLP_trt='Hyperlipidemics treatment'
           HLP='Hyperlipidemics';
run;