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What is regression analysis used for?
Regression analysis is used for
Dependent variable --> the variable we wish to predict or explain. --> Y
Independent variable --> the variable used to predict or explain the dependent variable. --> X
How is variation measued in regression?
What is the coefficiont of determination and howw can we calculate it?
The coeffision of determination is the portion of the total veariation in the dependet varibale that is explained by variation in the independent variable
the coefficient of determination is also called r-squared and is denoted as r^2
What are the assuptions of regression/diagnostics of regression? --> When these are not satisfied we probably missed something in the model.
Linearity: the relationship between x and y is linear
Equal variance (homoscedasticity)
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