Hi all,

I got an error message if I set model =F in polr(), like

> polr(y ~ x1 + x2, data1, model = F, method = "probit")

Error in model.frame(formula, rownames, variables, varnames, extras,
extranames,  :
        variable lengths differ (found for '(model)')
but

> polr(y ~ x1 + x2, data1, method = "probit")

would work.

Why? Thank you,

Tian

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