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Empirical cumulative distribution function

`[`

returns
the empirical function values, `f`

,`x`

]
= ecdf(`y`

,`Name,Value`

)`f`

, evaluated at
the points in `x`

, with additional options specified
by one or more `Name,Value`

pair arguments.

For example, you can specify the type of function to evaluate or which data is censored.

[1] Cox, D. R., and D.
Oakes. *Analysis of Survival
Data*. London: Chapman & Hall,
1984.

[2] Lawless, J. F. *Statistical
Models and Methods for Lifetime Data*.
2nd ed., Hoboken, NJ: John Wiley & Sons, Inc.,
2003.