R: Multinomial Logistic Regression with a subset of observations (Panel Data)

I have panel data with observations in different week-days to run a Multinomial Logistic Regression in R.

I know that mlogit package includes this topic on its usage definition:

mlogit(formula, data,subset, weights,....)

But I don't have any example that includes correlations between week-days.

Is it possible? Do you have any example?

Thanks a lot!