  We examine different measures of asymmetry for galaxy HI velocity profiles.
We introduce the channel-by-channel asymmetry and the velocity-of-equality
statistics to quantify profile asymmetries. Using a sample of simulated
galaxies, we examine how these and the standard lopsidedness morphometric
statistic depend on a variety of observational effects including the viewing
angle and inclination. We find that our newly introduced channel-by-channel
asymmetry is less sensitive to the effects of viewing angle and inclination
than other morphometrics. Applying our statistics to the WHISP HI galaxy
sample, we also find that the channel-by-channel asymmetry, is a better
indicator of visually-classified asymmetric profiles. In addition, we find that
the lopsidedness-velocity of equality space can be used to identify profiles
with deep central dips without visual inspection.
