At one point this morning, which seems typical, the indices were: Dow: -0.11% S&P: -0.46% NAZ: - 1.19% Relative to the Dow, right now the NAZ seems composed of more negatively performing stocks. The S&P is somewhere in between. Should the operators of the NAZ 'care'? Can any trading strategies take advantage of this divergence -- i.e., does it vary by much?
Take it with a grain of salt. The Nasdaq has a greater technology and small-cap component than the Dow which can create the appearance of a "divergence". The same applies to the S&P but on a reduced scale.