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At the Fermilab Tevatron proton-antiproton (pp) collider, high-mass electron-neutrino (eν) pairs are produced predominantly in the process pp → W (→ eν) + X. The asymmetry of the electron and positron yield as a function of their pseudorapidity constrain the slope of the ratio of the u-to dquark parton distributions versus the fraction of the proton momentum carried by the quarks. This paper reports on the measurement of the electron-charge asymmetry using the full data set recorded by the Collider Detector at Fermilab in 2001-2011 and corresponding to 9.1 fb −1 of integrated luminosity. The measurement significantly improves the precision of the Tevatron constraints on the parton-distribution functions of the proton. Numerical tables of the measurement are provided.

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