univariate_survival: Fit univariate survival Get the cost and coefficients for...
In csetraynor/predsurv: Build and compare diverse prediction survival models.

Fit univariate survival Get the cost and coefficients for univariate survival analysis.

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univariate_survival(d_train, x_vars, d_test = NULL, weights = NULL,
  ncores = 1L, time_var = "time", status_var = "status",
  cost = "ll", mod = c("cox", "reg"), save_file)

`x_vars`	vars to analysis
`ncores`	for parallel.
`time_var`	defults to time
`status_var`	defaults to status
`cost`	cost measure
`save_file`	should results be saved on file
`dat`	dataframe