formula : str or generic Formula object
The formula specifying the model
data : array-like
The data for the model. See Notes.
status : array-like
The censoring status values; status=1 indicates that an
event occured (e.g. failure or death), status=0 indicates
that the observation was right censored. If None, defaults
to status=1 for all cases.
entry : array-like
The entry times, if left truncation occurs
strata : array-like
Stratum labels. If None, all observations are taken to be
in a single stratum.
offset : array-like
subset : array-like
An array-like object of booleans, integers, or index
values that indicate the subset of df to use in the
model. Assumes df is a pandas.DataFrame
ties : string
The method used to handle tied times, must be either ‘breslow’
or ‘efron’.
missing : string
The method used to handle missing data
args : extra arguments
These are passed to the model
kwargs : extra keyword arguments
These are passed to the model with one exception. The
eval_env keyword is passed to patsy. It can be either a
patsy:patsy.EvalEnvironment object or an integer
indicating the depth of the namespace to use. For example, the
default eval_env=0 uses the calling namespace. If you wish
to use a “clean” environment set eval_env=-1.
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