ERSA                    ERSA: A package exploring regressions with a
                        Shiny app
add1_models             Constructs a list of fits by adding predictors
                        sequentially
createERServer          A function which returns a shiny server for
                        Exploratory Regression
createERUI              Constructs UI for Exploratory Regression app
drop1_models            Constructs a list of fits by dropping
                        predictors from the supplied model
exploreReg              A function to launch the Exploratory Regression
                        Shiny App
pcpPlot                 A PCP plot of the data, residuals or hat values
                        from regression fits
plotSeqSS               Plots barcharts of sequential sums of squares
                        of lm
plotSum                 Plots of model summaries
reorderTerms            Re-order model terms
termColours             Constructs colour vector for model terms
