It's definite on the list.. What's the problem?


When it comes to saving my rmarkdown is made so far, I have a problem. It says 'R cannot find a subject, prsa.train dataframe in korean, though prsa.train, it's definite on the list as you can see!

What list ? It seems only that you have a text file open in source pane with the same name. This does not create an R object in the environment for R to work with. You need to load tabular data with a function.
For introductory training in the use of R you might look into using swirl package which teaches R with R interactivly. Or the free book , r4ds (r for data science)

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