loglik_p: Observed-data log-likelihood for B-spline coefficients
In sarahlotspeich/sieveSurv: Nonparametric Survival Estimator with B-spline Sieves

Observed-data log-likelihood for B-spline coefficients

1	loglik_p(bspline_coeff, time, event, bspline, data, try_event_times = NULL)

`bspline_coeff`	Matrix of B-spline coefficients returned from `sieveSurv()`.
`time`	Column name for follow-up time.
`event`	Column name for event indicators.
`bspline`	Column names for B-spline basis.
`data`	Dataframe or matrix containing (at least) named columns `time`, `event`, `covar`, and `bspline`.
`try_event_times`	(Optional) Vector or dataframe of observed values of `time` (for events) to be used to create the complete dataset. If `NULL` (DEFAULT), then the unique event times from `data` will be used.