what is the difference between ols and t-test what is the loss function in ols which residual function is used in a non-OLS model? how to compare OLS and OLS models how to find minimum value of loss function why is it so important to use a loss function how to compare residuals between a linear model and a non-OLS model what is the difference between an OLS function and a loss function? how to compare an ols and a regression how to find the minimum residual for an OLS what is a loss function how do you compare residuals how to calculate residual in ols regression how do you find minimum residual value in ols how to compare residual models how do you find the smallest residuals on a linear model what is the loss function of an OLS model how to compare residual coefficients in a regression model how to compare residuals between OLS and OLS what to compare an OLS and an OLS model?