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	Time based market persistence is here defined as the tendency for any move to continue in the same direction for various periods of time.     A single market, for a short time, tends to show some persistence then reverses. This single market example is based on the Dow daily closes from 02 January 1900 to 24 April 1998.     Almost a century of daily data and a time series of over 26,000 data points roughly equidistant has been assessed for directional time persistence and some interesting results are obtained for the DOW:         • 'retracements' become increasingly likely as the 'trend' continues,         • weekly time persistence is lower than daily persistence,         • persistence diminishes with duration for both time horizons. The table below shows the smoothed persistence for each of daily and weekly time horizons.                                     DOW conditional                DOW conditional Given duration           Persistence %                    Persistence %                                     (for a day)                            (for a week)               1                                               55                                         52               2                                               52                                         52               3                                               51                                         51               4                                               50                                         51               5                                               50                                         49               6                                               49                                         49               7                                               49                                         46               8                                               48                                         40               9                                               47                                         39 Statistical footnote: Conditional probabilities have been used as appropriate for a single trade perception.		Welcome Self Assessment Links Inner Tendencies What's New Contact Us CALM Secrets Tip of the Week Risk of Ruin