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What is _n_?
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Answer / sru
The value of _N_ represents the number of times the DATA
step has iterated
| Is This Answer Correct ? | 23 Yes | 2 No |
Answer / raghu
This is a data counter variable used in SAS.
..Raghu
| Is This Answer Correct ? | 14 Yes | 3 No |
Answer / ravi
This is nothing but a implict variable created by SAS during
data processing. It gives the total number of records SAS
has iterated in a dataset. It is Available only for data
step and not for procs.
Eg. If we want to find every third record in a Dataset then
we can use the _n_ as follows
Data new-sas-data-set;
Set old;
if mod(_n_,3)= 1 then;
run;
Note: If we use a where clause to subset the _n_ will not
yield the required result.
| Is This Answer Correct ? | 13 Yes | 3 No |
Answer / cutepa1
Almost all the above answers are right, except one or few.
Here I provide a clear insight into _n_ variable. This is an
automatic variable of PDV(Program Data Vector) that returns
the no. of observations that it has iterated. There are
such variables like _error_, end=, in=, first.by-variabke,
last.by-variable,etc.. All these variables will not be
displayed in the target output.
Ex:
data new;
set ora.emp;
if _n_ >= 2 and _n_ <= 6 then output;
run;
/* as _n_ returns 'n'th observation our statement is to save
those obs when _n_ returns the value between 2 and 6. Hence
the 5 obs of the specified dataset between second and six
are saved into 'new'.
| Is This Answer Correct ? | 7 Yes | 0 No |
Answer / hymad
this option is used to pick up n number of observation from
particular dataset
| Is This Answer Correct ? | 7 Yes | 3 No |
Answer / vijaibhaskar
_ n_ give no.of times data step is itereated .it gives
correct observations nos only if IF SUBSET IS NOT USED in
the datastep
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / madhavi
_n_ is a automatic variable created by SAS.we can use this
like we use any variable that we created ourselfs and it
indicates the number of times SAS has looped through the
data step.
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / arun
IT IS AUTOMATIC VARIABLE SHOWS NUMBER OF ITERATIONS.
| Is This Answer Correct ? | 4 Yes | 1 No |
Answer / suresh b anisetty
_n_ is a automatic variable the function of _n_ is how many
times the data step begins to execute.
| Is This Answer Correct ? | 3 Yes | 1 No |
Answer / yuva
its an automatic variable.it shows no. of iterations gone
through in datastep
| Is This Answer Correct ? | 3 Yes | 2 No |
DATA ABC; INPUT TDATE DATE9. AVG; CARDS; 18APR2008 150.00 19APR2008 167.00 20APR2008 123.00 21APR2008 145.00 ; RUN HOW CAN I FIND THE DIFFERENCE BETWEEN AVG OF 18APR2008 ANF 21APR2008?? IF ANY ONE GETS IT PLS TRY TO POST IT.
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