Note that the DJIA also changes constantly over time (as discussed elsewhere in this thread), as do the weights assigned to the individual companies constitutin

Note that the DJIA also changes constantly over time (as discussed elsewhere in this thread), as do the weights assigned to the individual companies constituting it. The way that the DJIA changes isn't the same as an index of, say, the n most highly capitalised equities might (Fortune 5, 10, 20, S&P 500, etc.).