Answer / sru

The value of _N_ represents the number of times the DATA
step has iterated

Answer / raghu

This is a data counter variable used in SAS.

..Raghu

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.

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'.

Answer / hymad

this option is used to pick up n number of observation from
particular dataset

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

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.

Answer / arun

IT IS AUTOMATIC VARIABLE SHOWS NUMBER OF ITERATIONS.

Answer / suresh b anisetty

_n_ is a automatic variable the function of _n_ is how many
times the data step begins to execute.

Answer / yuva

its an automatic variable.it shows no. of iterations gone
through in datastep

what is null hypothesis? why do you consider that?

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0 Answers  

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