Thanks John for your reply.

the  reviewer comment:

asymmetric distribution could affect Principal
Component Analysis results,  symmetry of distribution should be
tested. Authors should also indicate if outliers were observed and
consequently excluded because they could affect factors

My question: what does it mean asymmetry distribution could affect PCA  ? and also outliers could affect factors?

sorry for this not R-help question.

Best regards

M



Le 15/03/13 14:05, John Kane a écrit :
> No idea of what sentence.  R-help strips any html and only provides a text message so all formatting has been lost.  I think the question is not really an R-help question but if you resubmit the post you need to show the sentence in question in another way.
>
> John Kane
> Kingston ON Canada
>
>
>> -----Original Message-----
>> From: mohamed.lajnef@inserm.fr
>> Sent: Fri, 15 Mar 2013 11:26:45 +0100
>> To: r-help@r-project.org
>> Subject: [R] reviewer comment
>>
>> Could someone explain me this sentence reviewer below in blod underlined,
>>
>> Authors should try to be more detailed in the description of analyses:
>> some of the details reported in the "Principal components analysis"
>> paragraph (Results) should be moved here.
>> Because a highly_/*asymmetric distribution could affect Principal
>> Component Analysis results,  symmetry of distribution should be
>> tested. Authors should also indicate if outliers were observed and
>> consequently excluded because they could affect factors*/_
>>
>> Any help would be greatly appreciated!
>>
>> Regards
>> ML
>>
>> --
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-- 
####################################
Mohamed Lajnef,IE INSERM U955 eq 15#
Ple de Psychiatrie 		   #	
Hpital CHENEVIER                  #
40, rue Mesly                      #
94010 CRETEIL Cedex FRANCE         #
Mohamed.lajnef@inserm.fr           #
tel : 01 49 81 32 79		   #
Sec : 01 49 81 32 90               #
fax : 01 49 81 30 99               #
####################################


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