/usr/lib/R/site-library/truncdist/INDEX is in r-cran-truncdist 1.0-2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10  | dtrunc                  Probability density function of truncated
                        random variables
extrunc                 Expected value of a truncated random variable
ptrunc                  Cumulative distribution function of a truncated
                        random variable
qqtrunc                 QQ Plot for a Truncated Random Variable
qtrunc                  Quantitle Function for Truncated Random
                        Variable
rtrunc                  Generate truncated random deviates
vartrunc                Variance of a truncated random variable
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