What is the primary reason the author dislikes the 'Unit per fixed amount' position sizing model?

According to the text, how many different position sizing techniques can be created by combining equity estimation and position sizing models?

Which position sizing technique is recommended for intraday traders due to its structured approach?

How does the 'Percentage volatility' model measure volatility?

What is the key advantage of the 'Percentage volatility' position sizing technique?