Description Format References Examples
Safety violations over time
A data frame with 30 observations on the following 4 variables.
year
a numeric vector
place
a factor with levels CA
, KY
,
MI
, NY
, TN
and TX
employees
a numeric vector
cases
a 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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