topic Re: PERCENT OF MISSING BY EACH GROUP VARIABLES in SAS Programming

PERCENT OF MISSING BY EACH GROUP VARIABLES

Cruise — Fri, 23 Jun 2017 03:01:54 GMT

I'd like to get an idea of an extent of missing for each group of questions (variables) in my survey data. P1-P10, B1-B2 and G1-G5 are example of series of questions with missing (no response from study particpants). I believe there is lot more efficient way of doing this.

CP=NMISS(OF P01-P10)+N(OF P01-P10);
CB=NMISS(OF B1-B2)+ N(OF B1-B2);
CG=NMISS(OF G1-G5)+ N(OF G1-G5);

NP=NMISS(OF P01-P10);
NB=NMISS(OF B1-B2); 
NG=NMISS(OF G1-G5); 

P_MISSING_PERCENT=NP/CP*100;
B_MISSING_PERCENT=NB/CB*100;
G_MISSING_PERCENT=NG/CG*100;

Any suggestions please?

Thanks

Re: PERCENT OF MISSING BY EACH GROUP VARIABLES

Reeza — Fri, 23 Jun 2017 03:12:12 GMT

Well, I think you can do it in one, but besides that it's the same calculation. I don't think you're saving very much here though.

array p(*) p01-p10;

p_missing = nmiss(of p(*)) / dim(p);

Re: PERCENT OF MISSING BY EACH GROUP VARIABLES

Cruise — Fri, 23 Jun 2017 13:15:40 GMT

@Reeza

CP=NMISS(OF P01-P10)+N(OF P01-P10);

Is there straightforward function to count the number of columns instead doing nmiss+n as shown in above code?

Re: PERCENT OF MISSING BY EACH GROUP VARIABLES

RickAster — Fri, 23 Jun 2017 17:18:11 GMT

If you are really asking how many variables are in the abbreviated variable list P01-P10, the answer will always be 10. The data step automatically creates the variables if they do not exist already in order to include them in the list.

If you are looking for an answer to the more general question, I don't know of a function to count the number of variables in a list. It is possible to define an array that contains the variable list, and then the DIM function will count the elements in the array:

array list(*) p01-p10;
cp = dim(list);

I wouldn't argue that this simplifies anything, though.