How to identify and delete empty datasets in an elegant manner

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  • 1. question regarding a character value in a numeric variable field
    Dear SAS-L listers, I have been given a SAS dataset in which most of the variables are numeric. (When looking at the viewtable the informat is 12., while the format is Best 12.) For these variables that are defined as numeric, their are some character values in the fields, i.e., N is the character value that I see with both view table and using proc print to print the values. Proc Content demostrates that there are no formats assigned to the variables. Likewise, I have tried to use proc dataset to remove any formats (just in case I was missing something.) Can anyone give me an idea of what could be going on with the fact that a character value seems (???) to be in a numeric field. Thanks for any help you can give me. Sincerely, Craig
  • 2. where can I get sample questions for the SAS base certificate?
    where can I get sample questions for the SAS base certificate? Best, Zhuo
  • 3. Question about Compute _before_
    Hi All: In my proc report, I need to list all patients by treatment group. That is to say, on any single page I can have only patients from say Treatment Group A. I have the following code in my proc report: =20 =20 proc report data=3Dx nowd split=3D'|'; columns trtn subjid lvtdt complet violspe othspec deathdt dcause1 escomm ovrespm dpdt subfut; =20 compute before _page_ / left; line "Treatment Group: " trtn trtgrpn.; endcomp; define trtn /'Treatment' group noprint; define subjid /'Subject' order order=3Dinternal; define lvtdt /'Last Date|of Visit' display; and so on.. =20 I must be missing something because what I am getting is a listing of all patients in the study with treatment group not being shown at all. Do I need to do anything before the proc report (I have sorted my dataset by all variables present in the columns statement in the same order).. =20 Any assistance is always appreciated. =20 TIA =20 Kumar Sridhar =20
  • 4. HGLM: PROC MIXED + PROC LOGISTIC?
    Dear all, Does anybody know a command for Hierarchical General Linear Modeling (HGLM)? I am sure that a SSI's software, called HLM, can do hierarchical non-linear modeling, but I would like to work with the data in SAS if possible. I would appreciate if any of you could show me an example command when I have a dichotomous (or categorical) dependent variable (dv), a level-one independent variable (lv1), a level-two independent variable (lv2), and a id code over two levels (id) as below: PROC MIXED DATA=hlm.educ IC; CLASS id; MODEL dv= lv1 lv2 lv1*lv2 / SOLUTION; RANDOM intercept lv1 / SUBJECT=id; RUN; ---------- PROC LOGISTIC DATA=hlm.educ; MODEL dv= lv1 lv2 lv1*lv2; RUN; Thank you very much for your help in advance. Aki

How to identify and delete empty datasets in an elegant manner

Postby Shelley.Baxter » Sun, 26 Mar 2006 02:58:01 GMT

Would this be a proc sql approach with the vtable?

Shelley S. Baxter, Ph.D.
Boeing Corp.
            509-637-4500

Re: How to identify and delete empty datasets in an elegant manner

Postby Jiann-Shiun.Huang » Sun, 26 Mar 2006 03:47:32 GMT

Shelley:

  If your datasets are "ORDINARY DATASET" as mentioned in Jack's paper,
then the following code should work for you.  You need to change
LibraryName to your libname without any quotation.

%let MyLib=%upcase(LibraryName);  /*Without any quote*/
proc sql noprint;
  select memname into :NameList separated by ' '
  from sashelp.vtable
  where libname="&MyLib" and nobs eq 0;
quit;

%put &NameList;

%macro droptbl(lib,nooblist);
  %let filecnt=%eval(%sysfunc(count(&nooblist,%str( )))+1);
  %put &filecnt;
  proc sql;
    %do i=1 %to &filecnt;
          %let dataset=%scan(&nooblist,&i);
          drop table &lib..&dataset;
    %end;
  quit;
%mend droptbl;

%droptbl(&MyLib,&NameList)
run;


J S Huang
1-515-557-3987
fax 1-515-557-2422

That's would I would do, if I knew the provenance of the data sets.
I'd probably use dictionary.tables rather than sashelp.vtable - it's
supposedly more efficient.

You do have to know how your data sets were created and modified -
there are some circumstances under which the observation count in
dictionary.tables will not be correct.  See my paper How Many
Observations Are In My Dataset?" at

< http://www.**--****.com/ ;.








---
Jack Hamilton
Sacramento, California

Re: How to identify and delete empty datasets in an elegant manner

Postby joewhitehurst » Sun, 26 Mar 2006 04:45:24 GMT

Or, you might consider the folllowing simple SAS Component Language program.

length memname $32;
init:
  submit continue;
     proc contents data=newtable._all_ dir noprint out=lib_contents;
     run;
  endsubmit;
lib_contents_dsid=open('lib_contents','i');
do until(fetch(lib_contents_dsid)^=0);
   temp_dsid=open('sashelp.'||memname,'v');
   if attrn(temp_dsid,'nobs')=0 then do;
      close_rc=close(temp_dsid);
      delete_rc=delete('newtable.'||memname);
  end;
end;
close_rc=close(lib_contents_dsid);
return;



Re: How to identify and delete empty datasets in an elegant manner

Postby shiling99 » Sun, 26 Mar 2006 04:48:52 GMT

You may modify the SQL below to achieve your needs.
HTH

1    data;
2    stop;
3    run;

NOTE: The data set WORK.DATA1 has 0 observations and 0 variables.
NOTE: DATA statement used (Total process time):
      real time           0.14 seconds
      cpu time            0.00 seconds


4    data;
5    stop;
6    run;

NOTE: The data set WORK.DATA2 has 0 observations and 0 variables.
NOTE: DATA statement used (Total process time):
      real time           0.03 seconds
      cpu time            0.00 seconds


7    data;
8    stop;
9    run;

NOTE: The data set WORK.DATA3 has 0 observations and 0 variables.
NOTE: DATA statement used (Total process time):
      real time           0.01 seconds
      cpu time            0.00 seconds


10
11   proc sql noprint;
12     select 'drop table '||compress(libname)||'.'||memname into:
dropstmt separated by ';'
13     from sashelp.vtable
14     where nobs=0 and memtype='DATA' and libname in ('WORK');
15     ;
16     &dropstmt
17     ;
NOTE: Table WORK.DATA1 has been dropped.
NOTE: Table WORK.DATA2 has been dropped.
NOTE: Table WORK.DATA3 has been dropped.
18   quit;
NOTE: PROCEDURE SQL used (Total process time):
      real time           0.07 seconds
      cpu time            0.01 seconds


19
20   %put >>>"&dropstmt"<<<;







Re: How to identify and delete empty datasets in an elegant manner

Postby RandyHerbison » Sun, 26 Mar 2006 07:15:46 GMT

entry libname :input :char;

dcl num rc;

init:
dsid=open('sashelp.vtable(where=(libname=upcase("' || libname || '") and
nobs=0))');
any=attrn(dsid,'ANY');
if any then do;
  do until(fetch(dsid)^=0);
    rc=delete('work.'||getvarc(dsid,varnum(dsid,'MEMNAME')));
  end;
end;
dsid=close(dsid);
return;

-----Original Message-----
From:  XXXX@XXXXX.COM  [mailto: XXXX@XXXXX.COM ]
On Behalf Of  XXXX@XXXXX.COM 
Sent: Friday, March 24, 2006 2:45 PM
To: Jiann-Shiun Huang;  XXXX@XXXXX.COM 
Subject: Re: Re: How to identify and delete empty datasets in an elegant
manner


Or, you might consider the folllowing simple SAS Component Language
program.

length memname $32;
init:
  submit continue;
     proc contents data=newtable._all_ dir noprint out=lib_contents;
     run;
  endsubmit;
lib_contents_dsid=open('lib_contents','i');
do until(fetch(lib_contents_dsid)^=0);
   temp_dsid=open('sashelp.'||memname,'v');
   if attrn(temp_dsid,'nobs')=0 then do;
      close_rc=close(temp_dsid);
      delete_rc=delete('newtable.'||memname);
  end;
end;
close_rc=close(lib_contents_dsid);
return;



Re: How to identify and delete empty datasets in an elegant manner

Postby joewhitehurst » Sun, 26 Mar 2006 07:24:35 GMT

andy,

Nice work. I noticed that my solution would not have worked because I left out a call set statement, so values of memname on the contents dataset would never have been moved into the SCL nonwindow variable of the same name causing the delete function to fail.

Joe

Re: How to identify and delete empty datasets in an elegant manner

Postby Shelley.Baxter » Sun, 26 Mar 2006 11:44:15 GMT





Thank you for the help. I can see that the Shiling approach is the most
compact and elegant. I will keep the dictionary vs vtable distinction in
mind. I have thought about learning SCL since I won a book about it as a
door prize and keep finding myself in that documentation area and that's
the only way something can be done. But if I bunny trail off on that now I
will never get the project done!

Re: How to identify and delete empty datasets in an elegant manner

Postby BenDray » Tue, 28 Mar 2006 19:05:41 GMT

Hi Joe/Randy,

I like the look of the SCL program above - however I've never used SCL
and just tried to copy/paste into a SAS session but it's not working.
Can you tell me how to run this SCL code please??

Many thanks!!

Ben


Re: How to identify and delete empty datasets in an elegant manner

Postby joewhitehurst » Wed, 29 Mar 2006 02:29:47 GMT

Ben,

You must place the code in a SAS Catalog as member type SCL and compile it
before you can execute it.

Joe

-----Original Message-----
From: SAS(r) Discussion [mailto: XXXX@XXXXX.COM ] On Behalf Of BenDray
Sent: Monday, March 27, 2006 5:06 AM
To:  XXXX@XXXXX.COM 
Subject: Re: How to identify and delete empty datasets in an elegant manner

Hi Joe/Randy,

I like the look of the SCL program above - however I've never used SCL
and just tried to copy/paste into a SAS session but it's not working.
Can you tell me how to run this SCL code please??

Many thanks!!

Ben

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Has anyone made something like that before and can share it with me ? I am 
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