R Under development (unstable) (2023-12-02 r85657 ucrt) -- "Unsuffered Consequences"
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> # test.makeThresholds.R
> 
> library(ordinal)
> 
> # Prvious bug which is now fixed:
> res <- ordinal:::makeThresholds(letters[1:3], "symmetric")
> stopifnot(length(res$alpha.names) == res$nalpha)
> # length(res$alpha.names) used to be 4
> 
> # Real data example:
> wine <- within(wine, {
+   rating_comb3b <- rating
+   levels(rating_comb3b) <- c("1-2", "1-2", "3", "4-5", "4-5")
+ }) 
> wine$rating_comb3b[1] <- "4-5" # Need to remove the zero here to avoid inf MLE
> ftable(rating_comb3b ~ temp + contact, data=wine)
             rating_comb3b 1-2  3 4-5
temp contact                         
cold no                     12  5   1
     yes                     8  8   2
warm no                      5  8   5
     yes                     1  5  12
> 
> fm.comb3_c <- clm(rating_comb3b ~ contact, #scale=~contact, 
+                   threshold = "symmetric", data=wine) # no error
> 
> proc.time()
   user  system elapsed 
   1.39    0.25    1.62