HC                      Covariance Matrix - (HC0, HC2, HC3, HC4 and
                        HC5)
Pboot                   Percentile Bootstrap Confidence Interval (Wild
                        Bootstrap) - Linear Models Heteroskedasticity
QT                      Quasi-t test in linear regression models
Tboot                   Bootstrap-t Confidence Interval (Wild
                        Bootstrap) - Linear Models Heteroskedasticity
hcci-package            Interval Estimation of Linear Models with
                        Heteroskedasticity
schools                 US Expenditures for Public Schools
