www.gusucode.com > stats 源码程序 matlab案例代码 > stats/ModifyaLinearModelExample.m
%% Modify a Linear Regression Model Using |step| % Fit a linear model to car data. Use |step| to evaluate whether a % quadratic model improves the fit quality. %% % Load |carsmall| data, and create a table using weight and model year predictors % with MPG response. load carsmall tbl = table(MPG,Weight); tbl.Year = categorical(Model_Year); %% % Make a linear model of |MPG| as a function of |Year| and |Weight|. mdl = fitlm(tbl,'MPG ~ Year + Weight') %% % Use |step| to adjust the model to potentially include full quadratic terms. mdl1 = step(mdl,'upper','quadratic')