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    %% Add Terms to Linear Regression Model  
% Create a model of the |carsmall| data without any interactions, then add
% an interaction term.   

%% 
% Load the |carsmall| data and make a model of the MPG as a function of
% weight and model year. 
load carsmall
tbl = table(MPG,Weight);
tbl.Year = categorical(Model_Year);
mdl = fitlm(tbl,'MPG ~ Year + Weight^2');  

%% 
% Add an interaction term to |mdl|. 
terms = 'Year*Weight';
mdl1 = addTerms(mdl,terms)