введите код здесь:
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'
Не знаю, интересует ли вас ответ на вашу проблему, но сегодня у меня возникла та же проблема, и я решил ее, загрузив последнюю версию программного обеспечения R.