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Re: st: Re: R: Minimal Detectable Difference
From
Steve Samuels <[email protected]>
To
[email protected]
Subject
Re: st: Re: R: Minimal Detectable Difference
Date
Tue, 5 Jun 2012 11:43:53 -0400
Roger Newson's -powercal- at SSC will also estimated minimum detectable risks. It's helpful that the paired t-test
reduces to the problem from two to one samples.
Steve
On Jun 5, 2012, at 9:33 AM, William Buchanan wrote:
Hi Lars,
It may not be Stata, but you could also take a look at G*Power. It's free and can be used to calculate various aspects of statistical power (e.g., required sample size to detect a given effect size, minimum detectable effect size, etc...). It doesn't calculate these sizes for SEM or MLM, but for most other models you can get quick and easy answers.
- Billy
Sent from my iPhone
On Jun 5, 2012, at 5:41, Lars Folkestad <[email protected]> wrote:
> That is what i ended up doing. But i hoped there was a nicer/smerter/more
> standardized way to do it.
> lars
>
> Den 05/06/12 14.06 skrev "[email protected]"
> <[email protected]>:
>
>>
>>
>>
>> Lars can probably simulate some scenarios with -sampsi-. I find this
>> approach particularly useful when the limited number of participants
>> available is due to budget constraints (as it is often the case, sadly).
>> Kindest Regards,
>> Carlo
>>
>>
>> -----Messaggio originale-----
>> Da: [email protected]
>> [mailto:[email protected]] Per conto di Lars Folkestad
>> Inviato: martedì 5 giugno 2012 13:39
>> A: [email protected]
>> Oggetto: st: Minimal Detectable Difference
>>
>> Dear List
>>
>> This might be a bit more of a stats question than a stata question.
>>
>> I am about to do a cross sectional study comparing two groups regarding a
>> measured continous variable.
>> I know the the variance of the measurement. No one has ever investigated
>> these groups before using this or similar machines. For practical reasons
>> i
>> only have a limited number of participants available for this project. I
>> am
>> now wondering what the minimal detectable difference between the two
>> groups
>> are with the number of participants i have available.
>>
>> I will use a t-test (paired, seeing the two groups are matched)
>>
>> How do i calculate this using stata?
>>
>> lars
>>
>> *
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
>>
>
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/