df1 {sure} | R Documentation |
Data simulated from a probit model with a quadratic trend. The data are described in Example 2 of Liu and Zhang (2017).
data(df1)
A data frame with 2000 rows and 2 variables.
y
The response variable; an ordered factor.
x
The predictor variable.
Liu, Dungang and Zhang, Heping. Residuals and Diagnostics for Ordinal Regression Models: A Surrogate Approach. Journal of the American Statistical Association (accepted).
head(df1)