Cerebral Palsy maybe/maybe not

We already hinted at where this is going. There is SIGNAL (within the scope of what we can measure with sensitivity). There is NOISE, that which makes signal hard to see or detect or which bedevils our detection tools.

Here’s an example where common sense & reasonable expectation & assumption prevents flawed conclusions.

A heavy smooth steel ball is rolled down a nicely made smooth incline. A camera is used to video the ball’s acceleration and travel. Data (x & y timed locations of ball center), frame by frame, are plotted. A jagged graph emerges. Jagged? A JAGGED graph? From that? Some unusual gravity thing going on? Forget the speed. What could make a steel ball so inertially insignificant so as to do anything in a non-smooth, jagged, way? What kind of ball is this???? Or maybe ... the camera was not secured properly and was jiggling. Look below. This is a computer generated knee angle curve of a normal person walking on a gymnasium floor with a HAND HELD camera recording the walk. White line. Do we suspect the camera person of having a tremor?