Data simulated from a probit model with heteroscedasticity. The data are described in Example 4 of Liu and Zhang (2017).
A data frame with 2000 rows and 2 variables.
x The predictor variable.
y The response variable; an ordered factor.
Liu, Dungang and Zhang, Heping. Residuals and Diagnostics for Ordinal Regression Models: A Surrogate Approach. Journal of the American Statistical Association (accepted).
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