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我现在正在学习R,我遇到了查找命令的问题.

我有分类数据

levels(job)
[1] "admin."        "blue-collar"   "entrepreneur"  "housemaid"    
[5] "management"    "retired"       "self-employed" "services"     
[9] "student"       "technician"    "unemployed"    "unknown"

现在我想简化这些级别,例如

levels(job) 
[1] "class1"  "class2" "class3" "unknown"

其中type1包括"admin.","entrepreneur",和"self-employed"; type2包括"blue-collar","management",和"technician"; type3包括"housemaid","student","retired",和"services"; unknown包括"unknown"和"unemployed".

为此,我可以使用哪个命令？谢谢!严