h = plot(mdl)
a plot of the full, fitted linear model,
The plot type depends on the number of predictor variables.
If there is just one predictor variable,
a scatter plot of the data along with a fitted curve and confidence
If there are multiple predictor variables,
an added variable plot.
If there are no predictors,
a histogram of the residuals.
An added variable plot illustrates the incremental effect on the response of specified terms by removing the effects of all other terms. The slope of the fitted line is the coefficient of the linear combination of the specified terms projected onto the best-fitting direction. The adjusted response includes the constant (intercept) terms, and averages out all other terms.
Create a model of car mileage as a function of weight and model year. Then create a plot to see the significance of the model.
Create a linear model of mileage from the
load carsmall tbl = table(MPG,Weight); tbl.Year = ordinal(Model_Year); mdl = fitlm(tbl,'MPG ~ Year + Weight^2');
Create an added variable plot.
The plot illustrates that the model is significant because a horizontal line does not fit between the confidence bounds.
select particular predictors for an added variable plot.