how do we stack data to use ols how are coefficient estimates stacked how to use ols for modeling Stacking Up a Panel which of the following is an example of an OLS model where the expected coefficient of error is subscripted? how to stack an OLS value how to use ols to calculate coefficients why is it used instead of pooled ols why do we use pooled OLS? why do you use a matrix stacked with coefficient estimates? how to stack data in an OLS model which model uses pooled ols why is stacked data used for ols why ols not a panel which variable is subscripted with $i$ why is ols used when the coefficient is stacked which variable is a panel ols estimator how do you ols an excel what is meant by stacking up ols? how to stack a model