How would you delete duplicate observations?
- 10 Answers
- 29733 Views
- Accenture, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / poornima
we can delete duplicate observations by using nodup or
nodupkey option in the proc sort
Example :-
Proc sort data=datasetname nodup;
run;
| Is This Answer Correct ? | 33 Yes | 12 No |
Answer / padmasri
In 3 ways we can delete the duplicate records.
1.procedure proc sort
in proc sort there are two ways to delete duplicate
observations:
* nodupkey
*noduprec
2.first. and last.
3.proc sql
these 3 ways we can delet the duplicate records in sas.
| Is This Answer Correct ? | 16 Yes | 0 No |
Answer / srinivas
there 3 options to delete duplicate obs
1. nodup
2. nodupkey
3.noduprec
if a entire record is duplicated in sense we use nodup of
nodup rec in proc sort procedure.
proc sort data=dsn nodup/noduprec;
by var;
run;
if a variable is repeated not a entire record . this time
we use nodupkey
proc sort data=dsn nodupkey;
by var;
run;
ex; in a dataset empid is repeated then use this syn. and
the empid is used in by var statement.
| Is This Answer Correct ? | 19 Yes | 5 No |
Answer / vijay
There are several ways to do this. However the easliest
code-wise is to use PROC SORT. For example:
PROC SORT DATA=mydata NODUPKEY;
BY variable;
RUN;
| Is This Answer Correct ? | 17 Yes | 7 No |
There are two ways of deleting the records from the dataset
with the help of PROC SORT.
1. Using NODUP/NODUPRECS
2. Using NODUPKEY
The first option deletes the records only if all the
variables values are repeated in the subsequent records.
The second options deletes the records only if the value of
the BY variables given in the BY clause are repeated in the
subsequent records.
| Is This Answer Correct ? | 4 Yes | 1 No |
What is SAS informats?
what is the difference between proc means and proc tabulate?
What areas of SAS are you most interested in?
How will you assign all the variables of an dataset into a macro variable separated by a space? For example if a dataset has variables A,B,C. Assign them to a macro variable X as X=A B C
Can you explain the process of calendar?
Which statement does not perform automatic conversions in comparisons?
Name statements that function at both compile and execution time.
Explain the use of proc print and proc contents?
Explain the purpose of retain statement.
How does proc sql work?
what has been your most common programming mistake? : Sas programming
What are the analysis datasets created, and what are the new variables created in CLINICAL SAS
1 Answers Accenture, Sciformix,
Teradata 
