| na.stinterp | Replace NAs by Stineman interpolation | 
| na.stinterp.default | Replace NAs by Stineman interpolation | 
| parabolaSlopes | Estimate the slope of an interpolating function using a parabola | 
| stinemanSlopes | Estimate the slope of an interpolating function using an arc | 
| stinterp | A consistently well behaved method of interpolation |