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Why we do not use standard divination instead to mean absolute error in Regression Models?

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As usual, My colleague "Jose" surprised "Austin Lasseter" (our Instructor) with a good question, and make the class stop for a while. This time Jose made a shock for all of us when he notes that the calculation of the "mean absolute error" is so close to the calculation of the "standard deviation". then he asks "why not using standard deviation?" he means Why we do not use standard divination instead to mean absolute error in Regression Models? Actually, when I focused more, I found something really fantastic, the "mean absolute error" which we study in Data science to make a Regression is the same the "Average Deviation"  or we commonly called it "The mean absolute deviation (MAD)" which we use it to measure the volatility of returns of the portfolio (in investment). And in the investment, we prefer to use the standard deviation rather than "The mean absolute deviation (MAD)", as both measures th

Is Apple stock still a good investment at the current price level ?

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It is a common Dream for all those people who are looking for a nice wealth, in a short time. I can not count how many times I talked with friends Like Hadi about those who Buy Amazon Stock in 2002 at about $8. and just after 5 years, the stock reaches $80 which means 1000% now those people worth $3400 per shear. yes, that is true (three thousand four hundred) .. pick your calculator to see how much that rate is?. This is the Fact, a good company and good project may worth like that. so the question is. who is the next? which stock can I buy right now and worth me 1000% after 5 years? I have the conviction for this number. I try to create a Financial analysis Model test this hypothesis for a particular stock price using python. this is a start-up of this project and my example here will be APPLE stock.  So the question is (Is Apple stock still a good investment at the current price level?) let see how was the price a 5 years ago and haw the risk was? and how much gain from 5 years till