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=== Lasso/glmnet, adaptive lasso and FAQs ===
 
** Strongly correlated covariates have similar regression coefficients, is referred to as the '''grouping''' effect. From the wikipedia page ''"one would like to find all the associated covariates, rather than selecting only one from each set of strongly correlated covariates, as lasso often does. In addition, selecting only a single covariate from each group will typically result in increased prediction error, since the model is less robust (which is why ridge regression often outperforms lasso)"''.
<math>\| \frac{c}{d} \|</math>
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