HC                      Covariance Matrix - (HC0, HC2, HC3, HC4 and
                        HC5)
Pboot                   Percentile Bootstrap Confidence Interval (Wild
                        Bootstrap) - Linear Models Heteroskedasticity
Tboot                   Bootstrap-t Confidence Interval (Wild
                        Bootstrap) - Linear Models Heteroskedasticity
hcci-package            Interval estimation for the parameters of
                        linear models with heteroskedasticity of
                        unknown form using bootstrap-t and percentile
                        bootstrap and schemes of the double bootstrap.
schools                 US Expenditures for Public Schools
