problem running unbalanced repeated measures anova

[pavlo888]

Hi,

I am having problems running an unbalanced repeated measures anova.

I have about 180 samples and my data looks like this:

  id    Subject_ID Sampling_time Sampling_site GH_name    GH    Diagnostic Diagnostic_new GH_new  shannon_entropy
  <chr> <chr>      <fct>         <chr>         <chr>      <chr> <fct>      <chr>          <chr>             <dbl>
1 1-10A 28         1             start         Van_Lommel 10    Healthy    NA             GH_10_H            3.72
2 1-10B 29         1             middle        Van_Lommel 10    Healthy    NA             GH_10_H            2.53
3 1-10C 30         1             end           Van_Lommel 10    Healthy    NA             GH_10_H            2.58
4 1-11A 31         1             start         Smets      11    Healthy    NA             GH_11_H            5.17
5 1-11B 32         1             middle        Smets      11    Healthy    NA             GH_11_H            6.38
6 1-11C 33         1             end           Smets      11    Healthy    NA             GH_11_H            4.61 

Then I am running the following command:

metadata_w_shannon %>%
  anova_test(
    dv = shannon_entropy,
    wid = id,
    between = Diagnostic,
    within = Sampling_time, 
    type = 3 #for unbalanced design
    )

But then I get the following error:

Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : 
  contrasts can be applied only to factors with 2 or more levels

However both the between and within columns are factors.

Any idea what might be wrong?

Cheers,
Pavlo