Measurement of Resistor Parasitics Inductance and Capacitance
It is like putting the resistor under test in parallel to a 50 ohm
  resistance (since the characteristic impedance of the type N connector
  was 50 ohm).


No, that is incorrect; the characteristic impedance of a piece of coax or a connector is a value that is the square root of the inductance to capacitance ratio of the part or cable. It isn't a real value of resistance i.e. if you put 1 volt across an N type connector, 20 mA doesn't flow continuously.

20 mA does flow but, only for a fraction of a nano second or so. 

If you applied 1 volt to an infinitely long piece of coax then 20 mA would flow indefinitely.