A process to measure the amount of "Y-PE-type long chain branching per 1000 total carbons" in an ethylene/α-olefin/diene interpolymer; said process comprising at least the following: a) dissolving the polymer in a solvent, to form a polymer solution; b) analyzing the polymer solution using 13C NMR, at an analysis temperature from 20°C to 200°C, and generating a 13C NMR spectrum; and wherein the polymer has a "Y-PE-type long chain branching" that has a signal for an alpha carbon (Y-PE α signal) that has a peak maximum located in the range from 34.0 ppm to 35.0 ppm; and wherein the polymer has an amount of the "Y-PE-type long chain branching" (A Y-PE ) that is determined from the following Equation A: A Y-PE = Y-PE α peak area / 3 wherein the "Y-PE α , peak area" is determined by integrating the area underneath the peak of the Y-PE α signal located in the range from 34.0 ppm to 35.0 ppm; and wherein the amount of "Y-PE-type long chain branching per 1000 total carbons" is determined by integrating the area under the entire 13C NMR spectrum to obtain an area A, and then subtracting from A, the area of the "peak area due to solvent (S)", to obtain the "total peak area due to polymer (P)," and wherein the "Y-PE-type long chain branching per 1000 carbons" is determined from the following Equation B: Y-PE-type long chain branching per 1000 carbons = A Y-PE / P × 1000 carbons and wherein, the location of the Y-PE α signal is determined by comparing the 13C NMR spectrum against a 13C NMR spectrum of a control polymer; and wherein the control polymer is an ethylene/1-octene copolymer that has a density from 0.910 to 0.930 g/cc and a melt index (I2) from 0.50 to 2.00 g/cc. a) dissolving the polymer in a solvent, to form a polymer solution; b) analyzing the polymer solution using 13C NMR, at an analysis temperature from 20°C to 200°C, and generating a 13C NMR spectrum; and wherein the polymer has a "Y-PE-type long chain branching" that has a signal for an alpha carbon (Y-PE α signal) that has a peak maximum located in the range from 34.0 ppm to 35.0 ppm; and wherein the polymer has an amount of the "Y-PE-type long chain branching" (A Y-PE ) that is determined from the following Equation A: A Y-PE = Y-PE α peak area / 3 wherein the "Y-PE α , peak area" is determined by integrating the area underneath the peak of the Y-PE α signal located in the range from 34.0 ppm to 35.0 ppm; and wherein the amount of "Y-PE-type long chain branching per 1000 total carbons" is determined by integrating the area under the entire 13C NMR spectrum to obtain an area A, and then subtracting from A, the area of the "peak area due to solvent (S)", to obtain the "total peak area due to polymer (P)," and wherein the "Y-PE-type long chain branching per 1000 carbons" is determined from the following Equation B: Y-PE-type long chain branching per 1000 carbons = A Y-PE / P × 1000 carbons and wherein, the location of the Y-PE α signal is determined by comparing the 13C NMR spectrum against a 13C NMR spectrum of a control polymer; and wherein the control polymer is an ethylene/1-octene copolymer that has a density from 0.910 to 0.930 g/cc and a melt index (I2) from 0.50 to 2.00 g/cc. <EOS>