Hello,

I have a dataframe assigning various scores on around 20 variables to a list of 
countries. The scores are rated on a scale of (D, C, B, A) and there are also 
some not rated ones (NR) and others are left blank (NA). I now wanted to 
transfer the scores into numeric values (such as NR=0, D=25, C=50, B=27, A=100), 
while also leaving the NA in the dataframe. Can I transform the whole dataframe 
at once or do I need to transform each column separately? How do I correctly 
specify the levels and labels of the new dataframe?

Thank you so much,

Katharina



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