I'm stunned by how quickly you identified and fixed the problem. I urge you to submit your revisions to those who maintain the Wolfram Demos. I cannot thank you enough!--DMW
I figured it out (mostly). Suppose we have a Poisson (or other) process whose mean slowly drifts in time. (Slow: on a time scale much longer than the time between samples) by a amount small in comparison to the nominal mean. As a PERIODIC model:...