"How does one determine similarity between people online?"

Flawed article at Quora
"How does one determine similarity between people online?"
NO ONE of those methods are useful to calculate personality similarity between daters [using the 16PF5 test or similar].
They are all rubbish.The 16PF5 normative personality test codifies personality with 16 variables taking integer values from 1 to 10 in stens (standardized tens).
The ensemble (whole set of different valid possibilities) of the 16PF5 is: 10E16, big number as All World Population is nearly 6.7 * 10E9

The answer to solve the above problem is: "How LIFEPROJECT METHOD calculates similarity"
A new quantitative method to calculate compatibility between prospective mates, based on quantized pattern comparison (part of pattern recognition by correlation)!!!