In part I we compare vector ($\bar{a}$) and arithmetic ($\bar{x}$) means of circular-type variates by showing how each changes with addition of one measurement (an) to (n - 1) measurements.

Recently, I was talking about vectors. At that time, I had to stop and recall how I had been representing vectors. Ideally, I should stick with the same notation I used in Basics: Vectors and Vector ...