Return a spline approximation of data.
spline_variable(varName, x, y, w = NULL)
| varName | character, name of variable |
|---|---|
| x | numeric input (not empty, no NAs). |
| y | numeric or castable to such (same length as x no NAs), output to match |
| w | numeric positive, same length as x (weights, can be NULL) |
spline y prediction