procedure :means freq print univariate Tabulate sort summary

PRINT: Syntax 
   PROC PRINT DATA= SAS-data-set
              DOUBLE
              NOOBS
              UNIFORM
              LABEL
              SPLIT= 'split-character'
              N
              ROUND
              HEADING= direction
              ROWS= page-format
              WIDTH= column-width;
      VAR variable-list;
      ID variable-list;
      BY variable-list;
           PAGEBY BY-variable;
           SUMBY BY-variable;
      SUM variable-list;

SORT: Syntax 
   PROC SORT DATA= SAS-data-set
             OUT= SAS-data-set
             NODUPLICATES|NODUPREC|NODUP
             NODUPKEY
             EQUALS|NOEQUALS
             REVERSE
             FORCE
             ASCII
             EBCDIC
             DANISH|NORWEGIAN
             FINNISH|SWEDISH
             NATIONAL
             SORTSEQ= collating-sequence
             SORTSIZE= memory-specification
             TAGSORT
             Host Options;
      BY <DESCENDING> variable ... ;     /* required */




UNIVARIATE: Syntax 
   PROC UNIVARIATE DATA= SASdataset
                   NOPRINT
                   PLOT
                   FREQ
                   NORMAL
                   PCTLDEF= value
                   VARDEF= DF|WEIGHT|WGT|N|WDF
                   ROUND= roundoff unit...;
      VAR variables;
      BY variables;
      FREQ variable;
      WEIGHT variable;
      ID variables;
      OUTPUT OUT= SASdataset keyword= names...;


MEANS: Syntax 
   PROC MEANS <option-list> <statistic-keyword-list>;
      VAR variable-list;
      BY variable-list;
      CLASS variable-list;
      FREQ variable;
      WEIGHT variable;
      ID variable-list;
      OUTPUT <OUT= SAS-data-set> <output-statistic-list>
             <MINID|MAXID <(var-1<(id-list-1)>
             <...var-n<(id-list-n)>>)>=name-list>;

Proc Freq: Syntax ;

The FREQ Procedure produces one-way to n-way frequency 

PROC FREQ < Options > ;
TABLES Requests < / Options > ;
BY Variables ;
WEIGHT Variable < / Options> ;

TEST Options ;
EXACT Statistic-Options < / computation-options > ;
OUTPUT < OUT=SAS-data-set > Options ;
RUN;

Proc Freq Data = Events;

Tables TRT*AE / Chisq;

Weight CNT;

Output Out=Chs_sta Chisq;

Run;

Proc SUMMARY and Proc MEANS are essentially the same procedure. Both procedures compute descriptive statistics. 

The main difference concerns the default type of output they produce. 

Proc MEANS by default produces printed output in the LISTING window or other open destination whereas Proc SUMMARY does not. 

Inclusion of the print option on the Proc SUMMARY statement will output results to the output window.

proc means data = sashelp.shoes;

run;

proc summary data = sashelp.shoes print; 

run;

PROC SUMMARY: syntax:

PROC SUMMARY <option>;

VAR variable(s)</options>;

BY variable;

CLASS variable(s) </ option(s)>;

FREQ variable;

ID variable(s);

OUTPUT <OUT=SAS-data-set><output-statistic-specification(s)>

<id-group-specification(s)> <maximum-id-specification(s)> 

<minimum-id-specification(s)></ option(s)> ;

TYPES request(s);

WAYS list;

WEIGHT variable;

run;

STATEMENT

BY-Calculate separate statistics for each BY group

CLASS-Identify variables whose values define subgroups for the analysis

FREQ-Identify a variable whose values represent the frequency of each observation

ID-Include additional identification variables in the output data set

OUTPUT-Create an output data set that contains specified statistics and identification variables

TYPES-Identify specific combinations of class variables to use to subdivide the data

VAR-Identify the analysis variables and their order in the results

WAYS-Specify the number of ways to make unique combinations of class variables

WEIGHT-Identify a variable whose values weight each observation in the statistical calculations.

Proc Tabulate :Syntax:- 

Proc Tabulate<options>;

Class variable list; 

Var analysis variable list; 

By variable list; 

Table table-specifications/<table options>; 

Classlev variable<s>/<options>; 

run;

AVERAGE

proc sort data=sashelp.class out=avgd;
by sex;
run;

proc sql;
create table avg  as select avg(age)as avrg, sex from sashelp.class
group by sex;
quit;
data bb;
SET AVGD avg;
BY SEX;
if missing (age)THEN DO
SEX= ""  ;
age=avrg;
END;
DROP AVRG;
run;

average

data base;
input id visit$ aval;
cards;
101 scr  20
101 base 25
101 v1   25
101 v2   26
102 scr  25
102 base 30
102 v1   25
102 v2   30
103 scr  23
103 base 33
;
run;

create seq
data gg;
set base;
by id;
if first.id=1 then seq=1;
else seq+1;
run;


data ds avg1;
set gg;
by id;
if seq > 2 then output avg1;
else output ds;
run;

proc sql;
create table dos as select avg(aval) as avg,id from avg1
group by id;
quit;
data final;
set ds avg1 dos;
by id;
if missing (aval) then aval=avg;
/*drop seq avg;*/
run; 

concept of LOCF WOCF BOCF MIN MAX

data HAVE;
input SUBJID  VISITN   AVAL;
cards;
001  1  26
001  2  41         
001  3  35
002  1  12
002  2  21
003  1  22
;
run;

/*locf*/
data want;
set have;
by SUBJID;
output;
if last.SUBJID;
DTYPE="LOCF";
if VISITN<5
then do VISITN = VISITN+1 to 5;
output;
end;
run;
/*wocf*/
proc sort data=have out=ds;
by subjid aval;
run;

data wocf;
set ds;
by subjid;
output;
if last.subjid=1;
dtype="wocf";
if visitn <5 then  do
visitn=visitn+1 to 5;
output;
end;
run;
proc sort data=wocf;
by subjid visitn aval;
run;

/*bocl*/
data base;
input id visit$ aval;
cards;
101 scr  20
101 base 25
101 v1   25
101 v2   26
102 scr  25
102 base 30
102 v1   25
102 v2   30
103 scr  23
103 base 33
;
run;

proc sort data=base out=base2;
by id decending visit ;
run;

data bocf;
set base2;
by id ;
if first.id=1 then seq=1;
else seq+1;
output;
if last.id=1;
dtype="bocf";
if seq <5 then do
seq=seq+1 to 5;
output;
end;
run;

proc sort data=bocf out=bocf1;
by id aval;
run;

data avg base1 post;
set base;
by id ;
if first.id=1 then seq=1;
else seq+1;
if  seq > 2 then output post;
else output base1;
run;
data ret;
set post;
by id;
if first.id=1 then x=aval;
else x+aval;
run;

calculation of LOCF

data HAVE;
input SUBJID  VISITN   AVAL;
cards;
001  1  26
001  2  41         
001  3  35
002  1  12
002  2  21
003 1   22
;
run;
data want;
set have;
by SUBJID;
output;
if last.SUBJID;
DTYPE="LOCF";
if VISITN<5
then do VISITN = VISITN+1 to 5;
output;
end;
run;

highest nth value in proc sql

data have;
input EMPNO Salary empcode $;
cards;
111 4000 A
112 6000 A
114 2000 A
115 8000 A
223 2000 B
226 1000 B
228 3000 B
300 500 C
333 700 C
345 300 C
356 200 C
320 700 C
;
run;
proc sql;
create table want as
 select *,
  (select count(*) from 
    (select distinct Salary,empcode from have) as b 
   where b.empcode=a.empcode and b.Salary gt a.Salary) as n
  from have as a
   where calculated n=2;
quit;

/*MOD */
/* Returns the remainder from the division of */
/* the first argument by the second argument*/
data jb;
set hi;
md=mod(x1,2);
mds=mod(x1,3);
run;

/*every 3rd value by mod*/
data nth;
set sashelp.class;
new=mod(_n_,3) eq 0;
/*if new=1 then output;*/
run;

/*LOCF (Last Observations Carry Forward) */

DATA TEST;
INPUT PAT VISIT LABSTD;
CARDS;
101 1 0.1
101 2 0.3
101 3 .
101 5 0.1
101 6 0.9
102 1 0.7
102 2 0.3
102 3 .
102 5 0.4
102 6 0.9
;
Run;
/*locf by lag*/
Data test1;
Set test;
LABSTD1=lag(LABSTD);
/*If LABSTD=. then LABSTD=LABSTD1; */
Run;

/*extract last 3 char values in a string*/

ex1:

data ram;
set sashelp.class;
string=substr(name,length(name)-2);
run;

ex2:

data have;  input number $;  var = substr(number,length(number)-2);cards;123456789012345698765432188888889999999994242424;run;

ex3:

data have;

input char $char20.;

cards;

1234567890

   123456

987654321

8888888

999999999

4242424

run;

data want;

set have;

length char_new $5;

char_new=left(reverse(char));

char_new=reverse(char_new);

run;

proc print data=want; run;

Character date to numeric date value

I have a variable CPN_DT that is char, length 80 format $80, has following value 

05/21/2010

07/01/2010

03/01/2011

How do I convert it to sas date? I used following, but it doesn't work

cpn_dt = input(trim(cpn_dt),MMDDYY10.);

How can I fix this?

I really wonder why sas read this as char type with length of 80, because I got this variable via proc sql through odbc to oracle database.

why does SAS not recognize this as a mmddyy10. value?

Well, it seems working for me, please see:

data have;

infile cards;

informat date $80.;

input date ;

cards;

05/21/2010

07/01/2010

03/01/2011

;

data want;

set have;

format _date mmddyy10.;

_date=input(trim(date),MMDDYY10.);

run;

proc sql;

  create table want1 as selectinput(substr(strip(cpn_dt),1,10),MMDDYY10.)

     as cpn_dt format mmddyy10.

        from have;

quit;

proc contents data=want1;run;

Introduction to the SAS System

SAS is an integrated system of software solutions that enables you to perform the following tasks: data entry, retrieval, and management report writing and graphics design statistical and mathematical analysis business forecasting and decision support operations research and project management applications development How you use SAS depends on what you want to accomplish. Some people use many of the capabilities of the SAS System, and others use only a few.

Overview of Base SAS 
Software Base SAS software contains the following: a data management facility a programming language data analysis and reporting utilities Learning to use Base SAS enables you to work with these features of SAS. It also prepares you to learn other SAS products, because all SAS products follow the same basic rules.