[R] friedman.test error: not an unreplicated complete block design

[Michael Dewey]

Dear Lindsay
If the problem is that you have an excess of zeroes you might look at 
the vignette for the package pscl which is called something like 
Regression models for count data.

On 13/04/2015 17:17, lindsay hanford wrote:
> Hello R Community,
>
> I am using the friedman.test() function to test differences in a non-normally
> distributed dataset, with a dependent variable that either a
> continuous variable or a ratio and has 2+ groups.
>
> I am using the friedman.test instead of a repeated measures ANOVA because
> my dataset violated the assumptions for using an ANOVA. I am looking to
> compare response means on an emotion-labelling task, between groups (HR,
> HC) and emotions (Happy, Sad, Angry, Fearful) where these variables are my
> group and block variables, respectively.
>
> When I use the following command:
>> friedman.test(Response~Group|Emotion, data=dataset)
> I get the following error:
> Error in friedman.test.default(c(1L, 1L, 0L, 0L, 0L, 1L, 0L, 2L, 0L, 0L,  :
>    not an unreplicated complete block design
>
> I believe I have set up my dataset correctly.. where Subject ID is repeated for
> the four categories of emotion. The variable Error contains the number of
> incorrect response corresponding to each emotion.
>
>
> *Subj  Group Emotion Response*94    HR    Happy  2
> 119   HC   Happy 0
> ....
> 3   HR   Sad   4
> 61 HC   Sad   2
> 64  HC  Sad   0
> ....etc
>
> I think the error c(1L, 1L, 0L, 0L, 0L, 1L, 0L, 2L, 0L, 0L,... ) corresponds
> to my Response variable and might not be happy about is the number of 0's that
> appear in that variable. However, this is the reason my dataset is not normally
> distributed and I cannot use rmANOVA.
>
> Any ideas how to deal with this error? Or whether I should be using a
> different statistical test?
> Thanks,
>
> Lindsay
>

-- 
Michael
http://www.dewey.myzen.co.uk/home.html