How to perform Arithmetic operation on Proc Means Output data?

[MUIZVHORA]

data neg_prices;
	set homework_one;
	if price<0 then price_type = 'neg';  * create new label: negative when price is less than zero and otherwise;
	else price_type = 'pos';
run;

proc means data=neg_prices n;a
	class price_type;					 * get number of observations for negative prices;
	var price;
run;
 

I have a proc means output as shown below:
I want to extract N from the table and evaluate N for neg/(N for neg + N for pos), pretty much get the proportion of negative data from total data. How to go about this problem?
SAS Output

The MEANS Procedure

Analysis Variable: Price price_type N Obs N

neg 594

pos 69478

594

69478

[Reeza]

You need to direct your output to a data set and then you can use it in further steps.

*Create summary statistics for a dataset by a 'grouping' variable and store it in a dataset;

*Generate sample fake data;
data have;
	input ID          feature1         feature2         feature3;
	cards;
1               7.72               5.43              4.35
1               5.54               2.25              8.22 
1               4.43               6.75              2.22
1               3.22               3.21              7.31
2               6.72               2.86              6.11
2               5.89               4.25              5.25 
2               3.43               7.30              8.21
2               1.22               3.55              6.55

;
run;

*Create summary data;
proc means data=have noprint;
	by id;
	var feature1-feature3;
	output out=want median= var= mean= /autoname;
run;

*Show for display;
proc print data=want;
run;

*First done here:https://communities.sas.com/t5/General-SAS-Programming/Getting-creating-new-summary-variables-longitudinal-data/m-p/347940/highlight/false#M44842;
*Another way to present data is as follows;

proc means data=have stackods nway n min max mean median std p5 p95;
    by id;
    var feature1-feature3;
    ods output summary=want2;
run;

*Show for display;
proc print data=want2;
run;

Though, PROC FREQ is more suited to what you want, not PROC MEANS.

This generates an output data set called WANT_FREQ. It should generate the percents as well.

proc freq data=sashelp.class;
table price_type /out=want_freq;
run;