Description Format References Examples
Safety violations over time
A data frame with 30 observations on the following 4 variables.
yeara numeric vector
placea factor with levels CA, KY,
MI, NY, TN and TX
employeesa numeric vector
casesa numeric vector
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
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