# smoothstate > Fast smoothing of state probabilities for Polars workflows ## Docs ### API Reference #### Binary state smoothing - [smooth_binary_state](https://uriahf.github.io/smoothstate/reference/smooth_binary_state.html): Smooth ``P(state=1 | prob)`` using rtichoke-compatible LOWESS #### Time-dependent state smoothing - [smooth_state_cox](https://uriahf.github.io/smoothstate/reference/smooth_state_cox.html): Smooth event-state probability using secondary Cox + 3-knot RCS