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The most commonly used prediction technique is Ordinary Least Squares Regression (OLS Regression). It has been applied in many fields like statistics, finance, medicine, psychology and economics. Many people, specially Data Scientists using this technique know that it has not gone with enough training to apply it and should be checked why & when it can or can't be applied.It's not easy task to find or explain about why least square regression  is faced much criticism when trained and trieddoi:10.14419/ijet.v7i3.12.17612 fatcat:zjf22kfssjcjxevhao22ipydw4