PH490KR_Session15

/*********************************
This program runs class
activity for session 15

Emily Lynch
March 22, 2018
**********************************/


*1. Use a lib name statement;
libname ph490kr "C:\Users\emilylynch\Desktop\ph490kr";


/*2. assign labels to each variable*/

*first, I will read the data into a temporary dataset, then I'll start adding labels within the same data step;

data sess15;
set ph490kr.VitDsess14; 

label ev_smk="ev_smk:ever smoked 20+ packs cigarettes"
	cur_smk="cur_smk:currently smoke"
	brand="brand:cigarette brand"
	cig_day="cig_day:cigarettes per day smoked"
	age_cig="age_cig:age started smoking"
	age_qt="age_qt:age quit smoking";
run;

/*3. write formats for the categorical variables and assign them. This takes two separate steps:
1--proc format to define the labels
2--assign the format within a data step
*/
proc format library=ph490kr;
value ynf 0="0_No" 1="1_Yes";
value cigdayf 1="1_1-10" 2="2_11-20" 3="3_21-30" 4="4_31-40" 5="5_41+" 99="99_missing";
run;

options fmtsearch=(ph490kr);
data sess15;
set sess15; /*note that I am overwriting my existing temporary dataset*/

format ev_smk ynf. cur_smk ynf. cig_day cigdayf.;
run; 

/*4. save as a permanent dataset and describe contents*/
data ph490kr.VitDSess14_ecl;
set sess15;
run;

proc contents data=ph490kr.VitDSess14_ecl;
run;


/***HERE IS HOW WE COULD INCORPORATE EVERYTHING WE'VE DONE INTO A SINGLE PROC FORMAT AND DATA STEP***/
proc format library=ph490kr;
value ynf= 0 "0_No" 1="1_Yes";
value cigdayf 1="1_1-10" 2="2_11-20" 3="3_21-30" 4="4_31-40" 5="5_41+" 99="99_missing";
value smokef 0="0_never smoker" 1="1_past smoker" 2="2_current smoker";
run;

options fmtsearch=(ph490kr);

data ph490kr.VitDSess14_ecl;/*note that this will save a permanent SAS dataset in my folder*/
set PH490KR.VitDSess14; 

label ev_smk="ev_smk:ever smoked 20+ packs cigarettes"
	cur_smk="cur_smk:currently smoke"
	brand="brand:cigarette brand"
	cig_day="cig_day:cigarettes per day smoked"
	age_cig="age_cig:age started smoking"
	age_qt="age_qt:age quit smoking";

format ev_smk ynf. cur_smk ynf. cig_day cigdayf.;

run;

*could use ph490kr.vitdsess14_ecl or sess15 but best practice is to use ph490kr.vitdsess14_ecl;
proc contents data=ph490kr.vitdsess14_ecl;
run;