Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Daniel Lüdecke <d.luedecke@uke.de>’
  
  Found the following (possibly) invalid URLs:
    URL: http://www.stat.columbia.edu/~gelman/research/published/standardizing7.pdf
      From: man/std.Rd
      Status: Error
      Message: SSL peer certificate or SSH remote key was not OK [sites.stat.columbia.edu]:
        server verification failed: certificate signer not trusted. (CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none)

Check: examples, Result: NOTE
  Examples with CPU (user + system) or elapsed time > 5s
       user system elapsed
  frq 5.066  0.132   1.059
  Examples with CPU time > 2.5 times elapsed time
       user system elapsed ratio
  frq 5.066  0.132   1.059 4.908

Check: tests, Result: NOTE
    Running ‘testthat.R’ [466s/21s]
  Running R code in ‘testthat.R’ had CPU time 21.8 times elapsed time

No changes to worse in reverse depends.