Comment installer « Hmisc » dans R

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entrez le code ici:

install.packages(Hmisc)

Warning in install.packages : unable to access index for repository https://cran.rstudio.com/src/contrib:
  cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES' Installing package into
  ‘C:/Users/Tushant/Documents/R/win-library/3.4’ (as ‘lib’ is unspecified) 
Warning in install.packages : unable to access index for repository https://cran.rstudio.com/src/contrib:
  cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages : package ‘Hmisc’ is not available (for R version 3.4.2)
Warning in install.packages : unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.4:
  cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/PACKAGES'
Créé 20/10/2018 à 03:33
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