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/usr/lib/R/site-library/sandwich/INDEX is in r-cran-sandwich 2.3-2-1.

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The actual contents of the file can be viewed below.

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Investment              US Investment Data
NeweyWest               Newey-West HAC Covariance Matrix Estimation
PublicSchools           US Expenditures for Public Schools
bread                   Bread for Sandwiches
estfun                  Extract Empirical Estimating Functions
isoacf                  Isotonic Autocorrelation Function
kweights                Kernel Weights
lrvar                   Long-Run Variance of the Mean
meat                    A Simple Meat Matrix Estimator
sandwich                Making Sandwiches with Bread and Meat
vcovHAC                 Heteroskedasticity and Autocorrelation
                        Consistent (HAC) Covariance Matrix Estimation
vcovHC                  Heteroskedasticity-Consistent Covariance Matrix
                        Estimation
vcovOPG                 Outer Product of Gradients Covariance Matrix
                        Estimation
weightsAndrews          Kernel-based HAC Covariance Matrix Estimation
weightsLumley           Weighted Empirical Adaptive Variance Estimation