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What is a linear regresion and what use does it have? What is the Gradient descent? How do we use does the linear coeficients come

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What is a linear regresion and what use does it have? What is the Gradient descent? How do we use does the linear coeficients come from? What does this formula mean? And why do we use de variance. R2=Var(errorPromedio)Var(errorPromedio)Var(errorModelo)

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