SAS code

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libname mydata "/courses/u_coursera.org1/i_1006328/c_5333" access=readonly; DATA new; set mydata.nesarc_pds; /*major depressive disorder ~ Sex, average daily quantity of alcohol consumed and cigarettes smoked in past 12 months, and use of sedatives, tranquilizers, cannabis, opioids, amphetamines, cocaine, heroine, hallucinogens, and inhalants*/ LABEL MAJORDEPLIFE="major depressive disorder (lifetime)" SEX="biological sex" S2AQ8B="alcohol consumed daily" S3AQ3C1="cigarettes smoked in past 12 months" S3BQ1A1="use of sedatives" S3BQ1A2="use of tranquilizers" S3BQ1A3="use of opioids" S3BQ1A4="use of amphetamines" S3BQ1A5="use of cannabis" S3BQ1A6= "use of cocaine" S3BQ1A7= "use of hallucinogens" S3BQ1A8= "use of inhalants" S3BQ1A9A="use of heroin"; /* DATA MUNGING */ /* for the following variables: alcohol consumed, cigarettes smoked */ /* change [9] to [NA] */ IF S2AQ8B=99 THEN S2AQ8B=.; /*alcohol*/ IF S3AQ3C1=99 THEN S3AQ3C1=.; /*cigarette*/ /* for the following variables: "sex", "sedatives", "tranquilizers", "cannabis", "opioids", "amphetamines", "cocaine", "heroine", "hallucinogens", "inhalants" */ /* change the binomial setting [1,2] --> [1,0] */ /* change [9] to [NA] */ IF SEX=2 THEN SEX=0; IF S3BQ1A1=2 THEN S3BQ1A1=0; IF S3BQ1A2=2 THEN S3BQ1A2=0; IF S3BQ1A3=2 THEN S3BQ1A3=0; IF S3BQ1A4=2 THEN S3BQ1A4=0; IF S3BQ1A5=2 THEN S3BQ1A5=0; IF S3BQ1A6=2 THEN S3BQ1A6=0; IF S3BQ1A7=2 THEN S3BQ1A7=0; IF S3BQ1A8=2 THEN S3BQ1A8=0; IF S3BQ1A9A=2 THEN S3BQ1A9A=0; IF S3BQ1A1=9 THEN S3BQ1A1=.; IF S3BQ1A2=9 THEN S3BQ1A2=.; IF S3BQ1A3=9 THEN S3BQ1A3=.; IF S3BQ1A4=9 THEN S3BQ1A4=.; IF S3BQ1A5=9 THEN S3BQ1A5=.; IF S3BQ1A6=9 THEN S3BQ1A6=.; IF S3BQ1A7=9 THEN S3BQ1A7=.; IF S3BQ1A8=9 THEN S3BQ1A8=.; IF S3BQ1A9A=9 THEN S3BQ1A9A=.; IF S3AQ3B1=9 THEN S3AQ3B1=.; IF S3AQ3C1=99 THEN S3AQ3C1=.; IF S2AQ8A=99 THEN S2AQ8A=.; IF S2AQ8B=99 THEN S2AQ8B=.; /* DATA BINNING - from QUANTITATIVE to CATEGORICAL BINS */ /*SMOKE = from FREQUENCY IN DAYS converted to NUMBER OF DAYS PER YEAR (days per year) */ IF S3AQ3B1= 1 THEN SMOKEFREQYR = 364; ELSE IF S3AQ3B1= 2 THEN SMOKEFREQYR = 286; ELSE IF S3AQ3B1= 3 THEN SMOKEFREQYR = 182; ELSE IF S3AQ3B1= 4 THEN SMOKEFREQYR = 78; ELSE IF S3AQ3B1= 5 THEN SMOKEFREQYR = 30; ELSE IF S3AQ3B1= 6 THEN SMOKEFREQYR = 1; /* assign NEW VARIABLE pack-years */ CIGSPERYEAR = SMOKEFREQYR * S3AQ3C1; /* ALCOHOL = from FREQUENCY IN DAYS converted to NUMBER OF DAYS PER YEAR (days per year) */ IF S2AQ8A= 1 THEN ALCOHOLFREQYR = 364; ELSE IF S2AQ8A= 2 THEN ALCOHOLFREQYR = 286; ELSE IF S2AQ8A= 3 THEN ALCOHOLFREQYR = 182; ELSE IF S2AQ8A= 4 THEN ALCOHOLFREQYR = 104; ELSE IF S2AQ8A= 5 THEN ALCOHOLFREQYR = 52; ELSE IF S2AQ8A= 6 THEN ALCOHOLFREQYR = 30; ELSE IF S2AQ8A= 7 THEN ALCOHOLFREQYR = 12; ELSE IF S2AQ8A= 8 THEN ALCOHOLFREQYR = 9; ELSE IF S2AQ8A= 9 THEN ALCOHOLFREQYR = 4.5; ELSE IF S2AQ8A= 10 THEN ALCOHOLFREQYR = 1.5; /* assign NEW VARIABLE drink-years */ SWIGSPERYEAR = ALCOHOLFREQYR * S2AQ8B; /*make bins for quantitative explanatory variables cigsperyear */ if CIGSPERYEAR LE 2002 then G4CIGS =1001.5; else if CIGSPERYEAR LE 4550 then G4CIGS = 3276; else if CIGSPERYEAR LE 7644 then G4CIGS =6097; else if CIGSPERYEAR GT 7644 then G4CIGS =21658; /*make bins for quantitative explanatory variables swigsperyear */ if SWIGSPERYEAR LE 10.5 then G4SWIGS = 6; else if SWIGSPERYEAR LE 63 then G4SWIGS = 36.75; else if SWIGSPERYEAR LE 360 then G4SWIGS =211.5; else if SWIGSPERYEAR GT 360 then G4SWIGS =35852; /*sort tables by row identifier*/ PROC SORT; by IDNUM; /*PROC ANOVA; CLASS MAJORDEPLIFE; MODEL AGE=MAJORDEPLIFE; MEANS MAJORDEPLIFE /TUKEY;*/ /*PROC ANOVA; CLASS G4CIGS; MODEL AGE=G4CIGS; MEANS G4CIGS /TUKEY;*/ /*PROC ANOVA; CLASS G4SWIGS; MODEL AGE=G4SWIGS; MEANS G4SWIGS /DUNCAN;*/ /*print each observation with the following variables in columns */ /*PROC PRINT; VAR MAJORDEPLIFE SEX G4CIGS G4SWIGS S3BQ1A1 S3BQ1A2 S3BQ1A3 S3BQ1A4 S3BQ1A5 S3BQ1A6 S3BQ1A7 S3BQ1A8 S3BQ1A9A*/ ; /*check center, spread, shape*/ /*PROC UNIVARIATE; VAR G4CIGS G4SWIGS MAJORDEPLIFE SEX S3BQ1A1 S3BQ1A2 S3BQ1A3 S3BQ1A4 S3BQ1A5 S3BQ1A6 S3BQ1A7 S3BQ1A8 S3BQ1A9A*/ ; /*check frequency tables*/ /*PROC FREQ; TABLES MAJORDEPLIFE SEX G4CIGS G4SWIGS S2AQ8B S3AQ3C1 S3BQ1A1 S3BQ1A2 S3BQ1A3 S3BQ1A4 S3BQ1A5 S3BQ1A6 S3BQ1A7 S3BQ1A8 S3BQ1A9A*/ ; RUN; /*get multiple pairwise tables for chi-squared test*/ /*this is for comparing G4CIGS classes versus majordepressive disorder*/ /*Bonferonni correction is 0.05 divided by 6 equals 0.008333333 */ DATA CIGSCOMPARISON1; set NEW; IF G4CIGS=1001.5 or G4CIGS=3276; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4CIGS /CHISQ; RUN; DATA CIGSCOMPARISON2; set NEW; IF G4CIGS=1001.5 or G4CIGS=6097; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4CIGS /CHISQ; RUN; DATA CIGSCOMPARISON3; set NEW; IF G4CIGS=1001.5 or G4CIGS=21658; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4CIGS /CHISQ; RUN; DATA CIGSCOMPARISON4; set NEW; IF G4CIGS=3276 or G4CIGS=6097; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4CIGS /CHISQ; RUN; DATA CIGSCOMPARISON5; set NEW; IF G4CIGS=3276 or G4CIGS=21658; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4CIGS /CHISQ; RUN; DATA CIGSCOMPARISON6; set NEW; IF G4CIGS=6097 or G4CIGS=21658; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4CIGS /CHISQ; RUN; /*this is for comparing G4SWIGS classes versus majordepressive disorder*/ /*Bonferonni correction is 0.05 divided by 6 equals 0.008333333 */ DATA SWIGSCOMPARISON1; set NEW; IF G4SWIGS=6 or G4SWIGS=36.75; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4SWIGS /CHISQ; RUN; DATA SWIGSCOMPARISON2; set NEW; IF G4SWIGS=6 or G4SWIGS=211.5; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4SWIGS /CHISQ; RUN; DATA SWIGSCOMPARISON3; set NEW; IF G4SWIGS=6 or G4SWIGS=35852; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4SWIGS /CHISQ; RUN; DATA SWIGSCOMPARISON4; set NEW; IF G4SWIGS=36.75 or G4SWIGS=211.5; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4SWIGS /CHISQ; RUN; DATA SWIGSCOMPARISON5; set NEW; IF G4SWIGS=36.75 or G4SWIGS=35852; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4SWIGS /CHISQ; RUN; DATA SWIGSCOMPARISON6; set NEW; IF G4SWIGS=211.5 or G4SWIGS=35852; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*G4SWIGS /CHISQ; RUN; /*COMPARE SUBSTANCES versus MDD */ /*for a 2 by 2 case, we are inclined to call the chi square statistic large, if it is larger than 3.841*/ /* you may check out http://math.hws.edu/javamath/ryan/ChiSquare.html for the table of df versus alpha*/ /*p value is simply 0.05, since it's not a multiple pairwise test*/ DATA COMPARISONS; set NEW; PROC SORT; by IDNUM; PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A1 /CHISQ; /*sedatives*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A2 /CHISQ; /*tranq*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A3 /CHISQ; /*opioids*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A4 /CHISQ; /*amphet*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A5 /CHISQ; /*cannabis*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A6 /CHISQ; /*cocaine*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A7 /CHISQ; /*hallucinogens*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A8 /CHISQ; /*inhalants*/ PROC FREQ; TABLES MAJORDEPLIFE*S3BQ1A9A /CHISQ; /*heroin*/ RUN;