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What is _n_?
 Question Submitted By :: SAS
I also faced this Question!!     Answer Posted By  
# 1
it gives the Number of iterations. 
Is This Answer Correct ?    78 Yes 15 No
# 2
_N_ gives the record number. You can access any record in
the dataset using _N_ if you know the record number. It is
set as 1 for the first record and incremented for every
subsequent record. It is an automatic variable and is not
visible when you open a dataset. This can also be used to
subset a data. For ex, if you want to access the first 100
records then you can say "if _N_ <= 100".
Is This Answer Correct ?    52 Yes 1 No
Chandra Sekar
# 3
suresh is write.
_n_ : gives the number of times SAS system looped through a
data step

Sudheer's answer is for _error_ :
_error_ : gives value of 0 or 1 depending on it is error or
not..if it is an error _error_ value will be 1 else 0
Is This Answer Correct ?    31 Yes 10 No
# 4
This is an automatic variable of PDV that returns the no of
observations that it has iterated.There are such variables
like _Error_,end=,in=,,,..etc
All these variables will not be displayed in the target output.
Data new;
set <existed>;
if _n_>=2 and <=6 then output;
Is This Answer Correct ?    4 Yes 1 No
Mallikarjuna Raju
# 5
_n_ is auto number drive in SAS...

if use fro data step look like this

data test1;
set test;

diferent if auto number for SQL procedure u can use this

proc sql;
create table test1 as
select *,monotonic() as test_field
from test;

Is This Answer Correct ?    2 Yes 0 No
Yadi Acho
# 6
Can i used _n_ in proc sql; Or its only for Datasteo

_n_ is a Autometic variable created in a datastep. It is a
part of PDV. It is used to store the iteration count of the
Input statement.

Proc SQL doesnot create a PDV. so _n_ variable cannot be
used there.
Is This Answer Correct ?    2 Yes 1 No
# 7
It acts like a pointer and can be used to subset your data
set _n_=10 in data step will force SAS to process the data
until first 10 observations
Is This Answer Correct ?    0 Yes 0 No
# 8
Compiling time of the program in PDV automatically some
variables will generate, like _N_ and _Error_, _numeric_
_N_ will give the observation in the program. by default
_N_ value is 0, after compiling it will chage according to
the observations in the program.
Is This Answer Correct ?    2 Yes 3 No
# 9
Can i used _n_ in proc sql; Or its only for Datasteo 
Is This Answer Correct ?    0 Yes 1 No
# 10
It is an automaic variable created during datastep
processing. And it show how many no of time it has iterated
Is This Answer Correct ?    1 Yes 3 No

Other SAS Interview Questions
  Question Asked @ Answers
How do i read multiple spaces in datasets?   4
wat has been most common programming mistake?   3
Write a SAS macro to calculate number of numbers in an email address   2
I need help in merging two different datasets. I am merging by date and I want to propagate observations from one dataset to the corresponding dates. One dataset has a unique date for each day of the month, while the other dataset has same date for different patient visits. For example I want to spread an observation on the 31DEC2008 from one dataset to several observations with the same date on a second dataset for all the patients who visited on that date. I have tried to merge the two and the result is not what I wanted. Instead I get a dataset whereby all the dates have missing values where observations from the first datset should have spread.   1
What would the following datastep do? Data _null_; Set Dist end=eof; Call Symput("xx"!!left(put(_n_,2.)),&dimension); If EOF then Call Symput('numrows',left(put(_n_,2.))); Run; dimension is a macro variable that is being passed here   2
what is the formula to measure Baseline   3
what is fact table and factless table?   1
How would you keep from overlaying the a SAS set with its sorted version?   4
how do u identify a macro variable   5
Does SAS ‘Translate’ (compile) or does it ‘Interpret’? Explain. Accenture 4
data data1; input dt account; format dt date9.; cards; 1745 1230 1756 1120 1788 1130 1767 1240 ; data data2; input startdt enddt total; format startdt date9. enddt date9.; cards; 1657 1834 12300 1557 1758 16800 1789 1789 12300 1788 1345 12383 1899 1899 13250 ; proc sql; create table data3 as select * from data1 as x left join data2 as y on x.dt>=y.startdt and x.dt<=y.enddt; quit; Here, we are getting cartision product. But,I want left join report consisting of this program. It should not get duplicate values. you can modify the program also.   1
Baseline definition in your study Accenture 3
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