BookmarkSubscribeRSS Feed
🔒 This topic is solved and locked. Need further help from the community? Please sign in and ask a new question.
monsieur
Obsidian | Level 7

Hi everyone,

 

I've been trying to create a function using PROC FCMP which will return a confidence interval (CI) using Wilson method. I would like to use the CI directly in a DATA step or PROC SQL. Here is the function : 

  

proc fcmp outlib = work.funcs.CI;

function CI_Wilson(r,n,output $,fmt,alpha) $;
    /* Define some values */
	p = r/n;
	q = 1 - p;
    z = probit(1-alpha/2);
	/* CI Wilson */
   	lower = (2*r+z**2-(z*sqrt(z**2+4*r*q)))/(2*(n+z**2));
    upper = (2*r+z**2+(z*sqrt(z**2+4*r*q)))/(2*(n+z**2));        
	/* CI */
	if output = "proportion" then ci = strip(put(r,10.)) || " " || strip(put(p,10.4)) || "(" || strip(put(lower,10.4)) || "-" || strip(put(upper,10.4)) || ")";
	else if output = "percent" then ci = strip(put(r,10.)) || " " || strip(put(p*100,10.4)) || "(" || strip(put(lower*100,10.4)) || "-" || strip(put(upper*100,10.4)) || ")";
	return(ci);
endsub;

quit;

options cmplib = work.funcs;
data _null_;
	ci_proportion = CI_Wilson(81,263,"proportion",10.4,0.05);
	ci_percent = CI_Wilson(81,263,"percent",10.4,0.05);
	put ci_proportion;
	put ci_percent;
run;

 It works fine if I write directly 

strip(put(p,10.4))

but SAS will give me error if I try

strip(put(p,fmt))
ERROR 22-322: Expecting a format name.
ERROR 202-322: The option or parameter is not recognized and will be ignored.

 

Furthermore, I already wrote a similar macro using DOSUBL and it worked fine with "fmt" as a macro variable. I just think for a simple calculation like this, it would be faster using PROC FCMP. If someone can suggest a solution, it would be greatly appreciated !!!

 

Thanks

1 ACCEPTED SOLUTION

Accepted Solutions
2 REPLIES 2
FriedEgg
SAS Employee

You need to use the putn function, not put.

monsieur
Obsidian | Level 7
Thank you FriedEgg, it works like a champ.

hackathon24-white-horiz.png

The 2025 SAS Hackathon has begun!

It's finally time to hack! Remember to visit the SAS Hacker's Hub regularly for news and updates.

Latest Updates

How to Concatenate Values

Learn how use the CAT functions in SAS to join values from multiple variables into a single value.

Find more tutorials on the SAS Users YouTube channel.

SAS Training: Just a Click Away

 Ready to level-up your skills? Choose your own adventure.

Browse our catalog!

Discussion stats
  • 2 replies
  • 1856 views
  • 0 likes
  • 2 in conversation