Collected data are just data, i.e: noisy unless from clean function.
From clean function strictly ► useless.
At this point, you can smooth from huge libraries, mostly Ksmooth.
Spline fit to noisy data ... no comment.
The B-Spline winds around the data points, i.e: smooth effect.
This document is lecture only ... eventually profitable.
Jean.

Spline Gaussian DEMO.sm (38 KiB) downloaded 79 time(s).