我一直在尝试使用 LAVAAN，这意味着我需要先设置“semPlot”。但是，当我尝试install.packages("semPlot")收到此消息时：
Warning in install.packages :
dependency ‘XML’ is not available
also installing the dependencies ‘RcppParallel’, ‘StanHeaders’, ‘rpf’, ‘sem’, ‘OpenMx’
There are binary versions available but the source versions are later:
binary source needs_compilation
RcppParallel 5.0.0 5.0.2 TRUE
StanHeaders 2.21.0-1 2.21.0-5 TRUE
rpf 1.0.3 1.0.4 TRUE
sem 3.1-9 3.1-11 TRUE
OpenMx 2.17.3 2.17.4 TRUE
我试过install.packages("XML")但收到package ‘XML’ is not available (for R version 3.5.2)我的版本是 1.1.463，所以我不确定发生了什么。
当我尝试召唤时，library(semPlot)我收到此错误消息：
Error: package or namespace load failed for ‘semPlot’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
there is no package called ‘sem’
谁能帮我解开这个谜语？非常感谢您的任何建议！