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  • ▪ Different results with df.dropna(axis='rows') and df.drop(index=np.where(df.isnull().sum()
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  • ▪ multiply every column of a dataframe with another column of that dataframe in R
  • ▪ Perform arithmetic operation with variables at t and t-1 (R)
  • ▪ change in the structure of table
  • ▪ How do I extract every first 4 digits from a numeric vector?
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