In article <[EMAIL PROTECTED]>,
Vadim and Oxana Marmer <[EMAIL PROTECTED]> wrote:
>You need to check (may be by simulations) if your test has any power to
>reject the null. If the power is low than get more subjects.
>On 12 Sep 2001, sylvie perera wrote:
>> Hi,
>> If a result is not significant, I realise this is because it may be due
>> to chance.
>> Is there a way of telling if more subjects are needed or there actually
>> is no difference between the groups?
>> Thanks in advance
>> Sylvie.
I would say that you are doing the wrong problem. I would
very rarely believe that there could be NO difference. So
what is the real problem, and what are the consequences?
--
This address is for information only. I do not claim that these views
are those of the Statistics Department or of Purdue University.
Herman Rubin, Dept. of Statistics, Purdue Univ., West Lafayette IN47907-1399
[EMAIL PROTECTED] Phone: (765)494-6054 FAX: (765)494-0558
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