How to show variable value by proc tabulate in sas? - sas

Question

How can I manage proc tabulate to show the value of a variable with missing value instead of its statistic? Thanks!
For example, I want to show the value of sym. It takes value 'x' or missing value. How can I do it?
Sample code:
data test;
input tx mod bm $ yr sym $;
datalines;
1 1 a 0 x
1 2 a 0 x
1 3 a 0 x
2 1 a 0 x
2 2 a 0 x
2 3 a 0 x
3 1 a 0
3 2 a 0
3 3 a 0 x
1 1 b 0 x
1 2 b 0
1 3 b 0
1 4 b 0
1 5 b 0
2 1 b 0
2 2 b 0
2 3 b 0
2 4 b 0
2 5 b 0
3 1 b 0 x
3 2 b 0
3 3 b 0
1 1 c 0
1 2 c 0 x
1 3 c 0
2 1 c 0
2 2 c 0
2 3 c 0
3 1 c 0
3 2 c 0
3 3 c 0
1 3 a 1 x
2 3 a 1
3 3 a 1
1 3 b 1
2 3 b 1
3 3 b 1
1 3 c 1 x
2 3 c 1
3 3 c 1
;
run;
proc tabulate data=test;
class yr bm tx mod ;
var sym;
table yr*bm, tx*mod;
run;

Answer 1

proc tabulate data=test;
class tx mod bm yr sym;
table yr*bm, tx*mod*sym*n;
run;
That gives you ones for each SYM=x (since n=missing). That hides the rows for SYM=missing, hence you miss some values overall from your example table. (You could format the column with a format that defines 1 = 'x' easily).
proc tabulate data=test;
class tx mod bm yr;
class sym /missing;
table yr*bm, tx*mod*sym=' '*n;
run;
That gives you all of your combinations of the 4 main variables, but includes missing syms as their own column.
If you want to have your cake and eat it too, then you need to redefine SYM to be a numeric variable, so you can use it as a VAR.
proc format;
invalue ISYM
x=1
;
value FSYM
1='x';
quit;
data test;
infile datalines truncover;
input tx mod bm $ yr sym :ISYM.;
format sym FSYM.;
datalines;
1 1 a 0 x
1 2 a 0 x
1 3 a 0 x
... more lines ...
;
run;
proc tabulate data=test;
class tx mod bm yr;
var sym;
table yr*bm, tx*mod*sym*sum*f=FSYM.;
run;
All of these assume these are unique combination rows. If you start having multiples of yr*bm*tx*mod, you would have a problem here as this wouldn't give you the expected result (sum 1+1+1=3 would not give you an 'x').