FPC Sample Size Power?
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From: Bminer on 26 Feb 2010 18:30 Hi all, Is there any way (SAS or otherwise) to determine the required sample size to test the difference in two means or proportions for a given power, given a finite population? In other words, say we have a sample frame of X people and I want to test a control versus a treatment. Short of 50/50 split, how can I allocate subjects to the treatment or control to reach my required power? Thanks!
From: Arthur Tabachneck on 26 Feb 2010 22:59 Will the following java applet suffice?: http://www.stat.ubc.ca/~rollin/stats/ssize/n2.html Art ------- On Fri, 26 Feb 2010 15:30:22 -0800, Bminer <b_miner(a)LIVE.COM> wrote: >Hi all, > >Is there any way (SAS or otherwise) to determine the required sample >size to test the difference in two means or proportions for a given >power, given a finite population? In other words, say we have a sample >frame of X people and I want to test a control versus a treatment. >Short of 50/50 split, how can I allocate subjects to the treatment or >control to reach my required power? > >Thanks!
From: Bminer on 27 Feb 2010 07:22 On Feb 26, 10:59 pm, art...(a)NETSCAPE.NET (Arthur Tabachneck) wrote: > Will the following java applet suffice?:http://www.stat.ubc.ca/~rollin/stats/ssize/n2.html > > Art > ------- > > > > On Fri, 26 Feb 2010 15:30:22 -0800, Bminer <b_mi...(a)LIVE.COM> wrote: > >Hi all, > > >Is there any way (SAS or otherwise) to determine the required sample > >size to test the difference in two means or proportions for a given > >power, given a finite population? In other words, say we have a sample > >frame of X people and I want to test a control versus a treatment. > >Short of 50/50 split, how can I allocate subjects to the treatment or > >control to reach my required power? > > >Thanks! Hi Arthur, Unless Im mistaken, there is no fpc in this program
From: Arthur Tabachneck on 27 Feb 2010 09:48 I didn't know that you needed to include a correction factor. Since you do, take a look at: http://www.fsrrn.net/modules/content/index.php?id=13 HTH, Art -------------- On Feb 27, 7:22 am, Bminer <b_mi...(a)live.com> wrote: > On Feb 26, 10:59 pm, art...(a)NETSCAPE.NET (Arthur Tabachneck) wrote: > > > > > > > Will the following java applet suffice?:http://www.stat.ubc.ca/~rollin/stats/ssize/n2.html > > > Art > > ------- > > > On Fri, 26 Feb 2010 15:30:22 -0800, Bminer <b_mi...(a)LIVE.COM> wrote: > > >Hi all, > > > >Is there any way (SAS or otherwise) to determine the required sample > > >size to test the difference in two means or proportions for a given > > >power, given a finite population? In other words, say we have a sample > > >frame of X people and I want to test a control versus a treatment. > > >Short of 50/50 split, how can I allocate subjects to the treatment or > > >control to reach my required power? > > > >Thanks! > > Hi Arthur, > Unless Im mistaken, there is no fpc in this program- Hide quoted text - > > - Show quoted text -
From: Bminer on 27 Feb 2010 16:25
On Feb 27, 9:48 am, art...(a)NETSCAPE.NET (Arthur Tabachneck) wrote: > I didn't know that you needed to include a correction factor. Since > you do, take a look at: > > http://www.fsrrn.net/modules/content/index.php?id=13 > > HTH, > Art > -------------- > On Feb 27, 7:22 am, Bminer <b_mi...(a)live.com> wrote: > > > > > On Feb 26, 10:59 pm, art...(a)NETSCAPE.NET (Arthur Tabachneck) wrote: > > > > Will the following java applet suffice?:http://www.stat.ubc.ca/~rollin/stats/ssize/n2.html > > > > Art > > > ------- > > > > On Fri, 26 Feb 2010 15:30:22 -0800, Bminer <b_mi...(a)LIVE.COM> wrote: > > > >Hi all, > > > > >Is there any way (SAS or otherwise) to determine the required sample > > > >size to test the difference in two means or proportions for a given > > > >power, given a finite population? In other words, say we have a sample > > > >frame of X people and I want to test a control versus a treatment. > > > >Short of 50/50 split, how can I allocate subjects to the treatment or > > > >control to reach my required power? > > > > >Thanks! > > > Hi Arthur, > > Unless Im mistaken, there is no fpc in this program- Hide quoted text - > > > - Show quoted text - Thanks Art. Can you just apply that formula to the n you arrive at with any type of design or test? (such as differences between 2 proportions)? |