topic Re: count number of times each id appears in dataset in SAS Programming

count number of times each id appears in dataset

Satori — Fri, 13 Oct 2023 08:12:54 GMT

I want to count the number of times each id appears in the whole dataset.

data example:

data have;
input id var1 var2;
datalines;
1	0	0
1	0	0
1	1	0
1	0	1
1	1	1
2	0	0
2	1	0
2	1	1
3	1	0
3	0	1
3	0	1
4	0	0
4	1	0
4	0	1
4	1	1
;
run;

What I want:

data want;
input id count;
datalines;
1	5
2	3
3	3
4	4
;
run;

Re: count number of times each id appears in dataset

PaigeMiller — Fri, 13 Oct 2023 08:31:26 GMT

Counting is a job for PROC FREQ

proc freq data=have;
    tables id/noprint out=counts(keep=count id);
run;

Re: count number of times each id appears in dataset

Satori — Fri, 13 Oct 2023 08:46:28 GMT

I did this, but the dataset hsa millions of observations so the dataset "counts" is huge and I cannot visualize it. Is there another way? My main goal is to know what is the frequency of the repetition of ids. So all the ids that appear once can be grouped, twice another group, etc.

Re: count number of times each id appears in dataset

PaigeMiller — Fri, 13 Oct 2023 09:01:02 GMT

Visualization was not mentioned in your original message. Visualization for what purpose? What type of visualization are you talking about ... please describe in more detail, or show us an example (perhaps from the Internet).

My main goal is to know what is the frequency of the repetition of ids. So all the ids that appear once can be grouped, twice another group, etc.

You could sort the output data set, which I named COUNTS, by the variable named COUNT.

Re: count number of times each id appears in dataset

Satori — Fri, 13 Oct 2023 09:08:18 GMT

By visualize I meant look at the resulting table from the proc freq step.

Re: count number of times each id appears in dataset

PaigeMiller — Fri, 13 Oct 2023 09:12:51 GMT

Not really understanding here. You have millions of observations, you cannot look at them in any reasonably comprehensive way. You said:

My main goal is to know what is the frequency of the repetition of ids. So all the ids that appear once can be grouped, twice another group, etc.

And then I gave a suggestion on how to do this. If that doesn't work for you, DESCRIBE in a lot more detail what you want, or better yet, show us. Don't make me guess. Don't use words like "visualize" which means different things to different people and doesn't make sense to me in this situation.

Re: count number of times each id appears in dataset

Kurt_Bremser — Fri, 13 Oct 2023 09:21:39 GMT

Run a second PROC FREQ on the result dataset of the first.