This file is indexed.

/usr/lib/R/site-library/gbm/INDEX is in r-cran-gbm 2.1.3-2.

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

The actual contents of the file can be viewed below.

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basehaz.gbm             Baseline hazard function
calibrate.plot          Calibration plot
gbm                     Generalized Boosted Regression Modeling
gbm-package             Generalized Boosted Regression Models
gbm.object              Generalized Boosted Regression Model Object
gbm.perf                GBM performance
gbm.roc.area            Compute Information Retrieval measures.
gbmCrossVal             Cross-validate a gbm
guessDist               gbm internal functions
interact.gbm            Estimate the strength of interaction effects
plot.gbm                Marginal plots of fitted gbm objects
predict.gbm             Predict method for GBM Model Fits
pretty.gbm.tree         Print gbm tree components
print.gbm               Print model summary
quantile.rug            Quantile rug plot
reconstructGBMdata      Reconstruct a GBM's Source Data
relative.influence      Methods for estimating relative influence
shrink.gbm              L1 shrinkage of the predictor variables in a
                        GBM
shrink.gbm.pred         Predictions from a shrunked GBM
summary.gbm             Summary of a gbm object
validate.gbm            Test the 'gbm' package.