Myanmar, Statistics, Machine Learning, Data Science.
The variance of X is equal to the expected value of the square of X minus the square of the expected value of X. ဒီေနရာမွာ ေမးစရာက တကယ္လို႔ (E[X])² က E[X²] ထက္ႀကီးရင္ negative variance ထြက္လာမွာေပါ့။ Variance ဆိုတာ positive value ပဲျဖစ္သင့္တာ မဟုတ္လား။ Jensen’s inequality က ဘယ္ convex function φ