[R] Ordinal Package

[Belle]

Hi,

Does anyone know if Ordinal package can be used for continuous covariate. In
CLMM function, can independent variables be continuous variables?

I used all dummy variable as the independent variables, the CLMM function
works, but when I added continuous variables in the model, it gave an error.

dr0, dr1, ismgdr, ismgyr_t_A are dummy variables, and yr_tch_exp,
yr_tch_exp_massignmentpair are continuous variables.

mathc.f <- factor(a$mathcontent)
b <- clmm(mathc.f ~ dr0 + dr1 + yr_tch_exp + yr_tch_exp_m + ismgdr + 
      ismgyr_t_A + assignmentpair, random=factor(schoolid), data = a, nAGQ
=10)

However, I got an error:
There were 50 or more warnings (use warnings() to see the first 50)

Thanks

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