## Is there a way to have a row zero?

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Occasional Contributor
Posts: 9

# Is there a way to have a row zero?

Hi,

I was wondering if it is possible to have a row zero, that will not be counted in an analyis, but would contain, important information.

Best,

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Solution
‎08-31-2016 10:27 AM
Super User
Posts: 13,557

## Re: Is there a way to have a row zero?

I would ask what you are doing that this is causin issues but the OBS number is not in the data set. So add a variable with the value you want:

Data work.one4;

set work.one3;

Obs = _n_ -1;

run;

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Super User
Posts: 10,259

## Re: Is there a way to have a row zero?

To store important information about the table within the table itself, look at column and dataset labels.

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Maxims of Maximally Efficient SAS Programmers
How to convert datasets to data steps
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Occasional Contributor
Posts: 9

## Re: Is there a way to have a row zero?

Posted in reply to KurtBremser

Well, the information I am storing tells the total amount of row entries divided by 3  for each row, in order to find a solution for the total amount of moves needed for a puzzel. In this case it will not be a label, however it will indicate how far you are from the solution.

Super User
Posts: 10,259

## Re: Is there a way to have a row zero?

The number of observations in a dataset can either be read from sashelp.vtable (dictionary.tables in PROC SQL), or you can use the nobs= option in the set statement to create a data step variable that holds that value.

---------------------------------------------------------------------------------------------
Maxims of Maximally Efficient SAS Programmers
How to convert datasets to data steps
How to post code
Super User
Posts: 23,749

## Re: Is there a way to have a row zero?

Wouldn't that be a column? Please post sample input and desire output.

Occasional Contributor
Posts: 9

## Re: Is there a way to have a row zero?

Here is my output. To rephrase my question: Is there a way to make an observation 0. I want obersevation 1 to be 0.

Solution
‎08-31-2016 10:27 AM
Super User
Posts: 13,557

## Re: Is there a way to have a row zero?

I would ask what you are doing that this is causin issues but the OBS number is not in the data set. So add a variable with the value you want:

Data work.one4;

set work.one3;

Obs = _n_ -1;

run;

Super User
Posts: 10,259

## Re: Is there a way to have a row zero?

There.is.no.observation.zero.in.a.SAS.dataset. Never.

You only can do that:

``````data want;
set have;
retain counter;
if _n_ = 1
then do;
counter = 1;
output;
counter = 0;
* set values for your "0" observation;
output;
counter = 1;
end;
else do;
counter + 1;
output;
end;
run;

proc sort data=want;
by counter;
run;
``````

This creates a virtual obs 0, but be aware that any sort other than by counter will move that "zero obs" to another place.

---------------------------------------------------------------------------------------------
Maxims of Maximally Efficient SAS Programmers
How to convert datasets to data steps
How to post code
Super User
Posts: 10,784

## Re: Is there a way to have a row zero?

```Check WEIGHT statement.

if you are using proc freq , check ZEROS option of WEIGHT.

```
☑ This topic is solved.

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