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下午好。我遇到了一个问题，与“tidyquant”包安装有关。当我输入：

install.packages ("tidyquant")

安装过程开始，但一段时间后我收到几条警告消息：

Warning in install.packages :
  dependency ‘PerformanceAnalytics’ is not available
also installing the dependencies ‘listenv’, ‘future’, ‘globals’, ‘ellipsis’, ‘furrr’, ‘hms’, ‘warp’, ‘glue’, ‘lifecycle’, ‘rlang’, ‘tibble’, ‘tidyselect’, ‘vctrs’, ‘cpp11’, ‘recipes’, ‘rsample’, ‘padr’, ‘readr’, ‘stringi’, ‘slider’, ‘anytime’, ‘dplyr’, ‘Quandl’, ‘riingo’, ‘alphavantager’, ‘tidyr’, ‘timetk’

Warning in install.packages :
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4/PACKAGES.rds': HTTP status was '404 Not Found'

安装过程完成后，我输入：

library(tidyquant)

并收到以下错误：

Error in library(tidyquant) : there is no ‘tidyquant’ package

谢谢您的帮助。

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