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我正在尝试精益 bnlearn 并遵循有关survey.txt 数据的示例。但是我收到以下错误,不知道如何解决。我是 R 和 bnlearn 的新手。任何意见,将不胜感激。

> survey
      A     R    E   O S     T
1 adult   big high emp F   car
2 adult small  uni emp M   car
3 adult   big  uni emp F train
4 adult   big high emp M   car
5 adult   big high emp M   car
6 adult small high emp F train
> View(survey)
> learned <- hc(survey)
Error in data.type(x) : 
  variable A is not supported in bnlearn (type: character).
> 
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