Date:         Tue, 6 May 2008 18:35:28 -0400
Reply-To:     Arthur Tabachneck <art297@NETSCAPE.NET>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Arthur Tabachneck <art297@NETSCAPE.NET>
Subject:      Re: calculate confidence interval for average cost
Comments: To: tammy1207@YAHOO.COM.TW

Tammy,

I think you are looking to do something like the following:

data have;
  input group response  cost;
  cards;
1       1                10
1       0                10
2       1                20
2       1                20
2       0                20
;

proc sql noprint;
  create table temp as
    select sum(cost)/sum(response) as cost_per_response
      from have
        group by group;
;
quit;

proc means data=temp alpha=.05 clm;
  var cost_per_response;
run;

HTH,
Art
---------
On Tue, 6 May 2008 12:18:38 -0700, tammy1207@YAHOO.COM.TW wrote:

>Hi,
>
>I have a data like this:
>
>group response  cost
>1       1              $10
>1       0                10
>2       1                20
>2       1                20
>2       0                20
>
>The cost per response for group 1 is $20 and group 2 is $30. How can I
>calculate the 95% confidence interval for cost per response?
>
>Thanks for any assistance you can lend.
>
>
>Tammy