Chapter 2 Conceptual overview of modelling

• what is a model: models, estimands, estimators and model specifications
• what do we do with models
• how do fit models

• once we have a fit model, how do we predict or do inference

• the difference between working with a single fit vs a set of fits. LASSO example: wanting to use the coefficients for prediction vs wanting to see the order in which features enter the model