[R] [Friedmann test for 2 factor mixed design] I need your help.I trying to do non-parametric 2way anova

[David Winsemius]

> On Aug 22, 2016, at 11:33 PM, 이아름 <judyoringe at naver.com> wrote:
> 
> 
> Hi!
> 
> I'm trying to do the non-parametric test for 2 factor mixed anova. 
> 
> I got 2 factors, one is within-subject factor, AGE(2levels), and the other is between-subject factor, Speed(6levels).
> One dependent variables, RT.
> 
> The data, I got, is not satisfied with the normality and homogeneity of variance. 

Those conditions are not applicable to the data but rather on residuals.
> 
> 
> So I tried to do the non-parametric test and use the Friedmann test function(friedman.test) in R . 
> 
> 
> and I got the error message as below.. 
> "Error in friedman.test.default(RT, Speed, AGE) : 
> friedman.test error: not an unreplicated complete block design"
> 
> How can I deal with this problem? 

Depending on the severity of lack of homogeneity of variance on residuals, you may (or may not)  need to consider robust methods.

https://cran.r-project.org/web/views/Robust.html

> Please help  
> 
> Thanks!
> 
> Kind regards, 
> 
> Ahreum 
> 
> 
> 	[[alternative HTML version deleted]]

Any response should be posted in plain text.

> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius
Alameda, CA, USA