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