Portfolio Spacing

Sometimes the optimal portfolios do not appear to be evenly spaced along the efficient frontier.  The portfolios could be spaced according to standard deviation, arc-length, or return, depending on what is set in preferences.  If you've selected return in preferences, the uneven spacing occurs because the Optimizer computes the portfolios to move up the frontier in increments of expected return.  At a classical confidence level, the increments are exactly equal, but estimation error prevents exact increments at other confidence levels.  The portfolios within the high risk section (the right) of the frontier appear to be more spread out because a slight increase in expected return results in a large increase in risk.