HI SFSecurity "To avoid buying at too high a price and creating a high risk position, one might buy a much smaller position, say 10% and 90% cash (mostly virtual) when entering."
This is the job of the market timer after you have selected your stock. "Market timing is nothing more than viewing statistically valid data to derive probabilities for future price moves." When the market timer indicates an entry into your selected stock, from a probability standpoint, one can confidently use the 80/20 or higher allocation to enter an aim position. In my method, stock selection warrants only consideration as an investment. The actual purchase or aim entry into position depends on the selected stock and market timer going hand in hand.