This file is indexed.

/usr/lib/R/site-library/sandwich/INDEX is in r-cran-sandwich 2.2-8-1.

This file is owned by root:root, with mode 0o644.

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
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