boxplot.sas

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%MACRO boxplot(
   data   =
  ,x      =
  ,y      = 
  ,group  = 
  ,report =
);

%local dsid grouptype xvalues xvalues2;

/*-- check input data set ----------------------------------------------------*/
%let dsid=%sysfunc(open(&data));
%if &dsid=0 %then %do; 
   %put ERROR: boxplot: Data set &data does not exist; 
   %return; 
%end; 
/*-- check whether x variable has been specified -----------------------------*/
%if "&x"="" %then %do;
   %put ERROR: boxplot: X variable not specified; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 
/*-- check for existence of x variable ---------------------------------------*/
%if %sysfunc(varnum(&dsid,&x))=0 %then %do;
   %put ERROR: boxplot: Variable &x does not exist in data set &data ; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 

/*-- check whether x variable is numeric -------------------------------------*/
%if %sysfunc(vartype(&dsid,%sysfunc(varnum(&dsid,&x)))) NE N %then %do;
   %put ERROR: boxplot: Variable &x in data set &data must be numeric; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 
/*-- determine values of x variable for axis ---------------------------------*/
proc sql noprint;
   select distinct &x into :xvalues separated by '" "' from &data;
   select distinct &x into :xvalues2 separated by ' ' from &data;
quit;
/*-- check whether y variable has been specified -----------------------------*/
%if "&y"="" %then %do;
   %put ERROR: boxplot: Y variable not specified; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 
/*-- check for existence of y variable ---------------------------------------*/
%if %sysfunc(varnum(&dsid,&y))=0 %then %do;
   %put ERROR: boxplot: Variable &y does not exist in data set &data ; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 
/*-- check wheter y variable ist numeric -------------------------------------*/
%if %sysfunc(vartype(&dsid,%sysfunc(varnum(&dsid,&y)))) NE N %then %do;
   %put ERROR: boxplot: Variable &y in data set &data must be numeric; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 
/*-- check whether group variable has been specified -------------------------*/
%if "&group"="" %then %do;
   %put ERROR: boxplot: Group variable must be specified; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 
/*-- check for existence of group variable -----------------------------------*/
%if %sysfunc(varnum(&dsid,&group))=0 %then %do;
   %put ERROR: boxplot: Variable &group does not exist in data set &data ; 
   %let dsid=%sysfunc(close(&dsid));
   %return; 
%end; 
/*-- check for number of groups and determine variable type and group sequence -*/
%let grouptype=%sysfunc(vartype(&dsid,%sysfunc(varnum(&dsid,&group))));
%local count lower;
proc sql noprint;
   select count(distinct &group) into :count from &data;
   select min(&group) into :lower from &data;
quit; 
%if &lower=. %then %do; 
   %put ERROR: boxplot: Missing values in group variable are not allowed; 
   %return; 
   %*** This is code not covered by any test case and left intentionally here to ***;
   %*** demonstrate the functionality of the test coverage                       ***;
   proc sql noprint; drop table &d_1; quit;
%end; 
%if &count NE 2 %then %do;
   %put ERROR: boxplot: Variable &group must have exactly two values; 
   %return; 
%end; 

%let dsid=%sysfunc(close(&dsid));

/*-- calculate distance between the x values ---------------------------------*/
%local d_1;
DATA; RUN; 
%let d_1=&syslast; 

proc sql noprint;   
   create table &d_1 as select distinct &x from &data;
quit;
 
data &d_1; 
   set &d_1; 
   &x = &x - lag(&x);
   if _n_>1 then output; 
run; 

%local xdiff1 xdiff2 xmin xmax misscount;
proc sql noprint; 
   select mean(&x), min(&x) into :xdiff1, :xdiff2 from &d_1;
   select min(&x), max(&x) into :xmin, :xmax from &data;
%let misscount=0;
   select count(*) into :misscount from &data where &x is missing;
quit;
%if &xdiff1=. %then %do;
   %put ERROR: boxplot: x variable must have at least two values;
   proc sql noprint; drop table &d_1; quit;
   %return; 
%end; 
%if &misscount>0 %then %do; 
   %put ERROR: boxplot: Missing values in x variable are not allowed;
   proc sql noprint; drop table &d_1; quit;
   %return; 
%end; 

%let xmin=%sysevalf(&xmin-&xdiff1);
%let xmax=%sysevalf(&xmax+&xdiff1);

run; 
%if &xdiff1 ne &xdiff2 %then %do; 
   %put ERROR: boxplot: Values of x variable are not equidistant;
   proc sql noprint; drop table &d_1; quit;
   %return; 
%end; 

/*-- calculate offset between the plots of the two groups --------------------*/
%local d_plot;
data;
   SET &data (KEEP=&x &y &group);
   IF &group = %if &grouptype=N %then &lower; %else "&lower"; THEN DO;
      &x = &x - 0.11*&xdiff1;
   END;
   ELSE DO;
      &x = &x + 0.11*&xdiff1;
   END;
RUN;
%let d_plot=&syslast;

/*-- create chart ------------------------------------------------------------*/
GOPTIONS FTEXT="Helvetica" HTEXT=12pt hsize=16cm vsize=16cm;
SYMBOL1 WIDTH = 3 BWIDTH = 3 COLOR = gray  LINE = 2 VALUE = none INTERPOL = BOXJT00 MODE = include;
SYMBOL2 WIDTH = 3 BWIDTH = 3 COLOR = black LINE = 1 VALUE = none INTERPOL = BOXJT00 MODE = include;
AXIS1 LABEL=(ANGLE=90) MINOR=none;
AXIS2 ORDER=(&xmin &xvalues2 &xmax) VALUE=(" " "&xvalues" " ") MINOR=none;
LEGEND1 FRAME;

ODS PDF FILE="&report";
ODS LISTING CLOSE;
PROC GPLOT DATA=&d_plot;
   PLOT &y * &x = &group / VAXIS=Axis1 HAXIS=Axis2 LEGEND=Legend1 NOFRAME;
RUN;
QUIT;
ODS PDF CLOSE;
ODS LISTING;

proc sql noprint; 
   drop table &d_plot; 
   drop table &d_1; 
quit;

%MEND boxplot;