The market is a very emotional place that appeals to fear and greed.
When it comes to investing, my suggestion is to first understand your strengths and weaknesses, and then devise a simple strategy so that you can sleep at night!
Be aware of the level of the stock market. Are yields low and PE ratios high?
Fear and greed tend to affect one's judgement.
I agree with Warren to keep it simple and not use higher mathematics in your analysis.
When I buy a stock, I have kind of an idea where I want to sell it.