[R] one sample test

meng laomeng_3 at 163.com
Thu Feb 5 15:55:35 CET 2015


Very sorry that I ignore the question type.Yest,it's not an R question.
Many thanks for your answer.







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At 2015-02-05 18:26:01,"peter dalgaard" <pdalgd at gmail.com> wrote:
>
>On 05 Feb 2015, at 09:20 , meng <laomeng_3 at 163.com> wrote:
>
>> Hi all:
>> If I want to test whether the mean of a set of normal distributed data is different from a value(e.g. 0), I can use one sample t test . But if the data is not normal distributed,what kind of method should be used?
>> 
>
>Not really an R question is it?
>
> (stats.stackexchange.com is -----> over there)
>
>Anyways, short answer: If you can assume symmetry under the null hypothesis, there is a one-sample wilcox.test (signed rank test) and a couple of similar tests. If the distribution is not symmetric, first decide if you really mean the mean. If you actually mean median, there's the sign test. If you really do mean the mean, I'd look at the t test supplemented with bootstrap simulations to see whether departure from normality matters much.
>
>> Many thanks!
>> 
>> 
>> My best.
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>-- 
>Peter Dalgaard, Professor,
>Center for Statistics, Copenhagen Business School
>Solbjerg Plads 3, 2000 Frederiksberg, Denmark
>Phone: (+45)38153501
>Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
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