How to find the every second observations in a dataset

[ForrestYao]

Hi there,

I remind an interview question a long time ago. the dataset looks like this:

ID Value

1  80

2  70

3  50

4  40

5  80

6  79

8  46

9  67...

The question is that: create a table that contains every second record in this dataset.

So the desired output would be sth like:

2 70

4 40

6 79

9 67...

Can anyone provide some tips ?

Thanks a lot!

[PaigeMiller · Accepted solution]

data want;
    set have;
    if mod(_n_,2)=0;
run;