Originally Posted by
Jimbo
So really, the HHT test has two parts, and people either forget or ignore or don't know about the second and most important part. First you waft the hair over the edge (this is the bit people mistakenly think is the HHT). Second, and this is the most important part of the HHT, you test shave it and relate the results of the first part to the results of the second part.
Do this test several hundred independent times under varying conditions to get a decent sample size. Then you are in a position to know what the HHT is telling you.
James.