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Good Morning I want to perform a synthetic control method with R. For this purpose, I created the following code: # Re-load packages library(Synth) library(readxl) # Pfadeinstellung Excel-Blatt excel_file_path <- ("C:\\Users\\xxxxx\\Desktop\\DATA_INVESTMENTVOLUMEN_FOR_R_WITHOUT_NA.xlsx") # Load the Excel file INVESTMENTVOLUME <- read_excel(excel_file_path) # Anzeigen des gesamten Dataframes print(INVESTMENTVOLUME) # Make sure BFS is numeric right before dataprep INVESTMENTVOLUME$BFS <- as.numeric(INVESTMENTVOLUME$BFS) # runnin...