r - ggplot within function can't find dataframe passed to function -

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I have the following functions that I want to use in datasets to generate density histogram of various features: fraudsplitHist & lt; - Function (dataframe, stat_col, sign_col = 'fraud') {hist_data & lt; - Data Frame [, C (stat_col, sign_col)] colnames (hist_data) & lt; - c ('stat', 'fraud') hist_data $ stat & lt; - winsor1 (hist_data $ stat) # Remove outliers ggplot (hist_data, AES (hist_data $ stat, fill = as.factor (hist_data $ fraud)) + geom_histogram (alpha = 0.5, AES (Y = .. density ..), This error always gives me this error by running 

  fraudSplitHist (dataframe = data, stat_col = '' = 'id =' detection ', binwidth = 1)}   
 However, it works with qplot  <('state', 'some_column_of_values') errors in excal (expro, envir, enclose): object 'hist_data' not found   
 "State", "Fraud"), (hist_data & lt; - dataframe [, c (stat_col, fraud_col)] coln hist_data $ stat & lt; - winsor1 (hist_data $ stat) qplot (data = hist_data, x = stat, geom = "histogram", fill = as as ames (hist_data) & lt; -c ('stat', 'cheat') .factor (fraud), binwidth = 10, position = 'detection'}}   
 Any thoughts that I can remember here?   
 
 
 You should not have to specify the name.frame name in your  AES ()  settings. You should use column names only from data. For example, this should work  
  simplest

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