The R script "Math4Speed_preprocessing.R" runs on the file "Math4Speed_Data_template.csv" (see component collaboration) and gives the final variables: - *sum_speeded* = Sum score all arithmetic operations - *add_sum_score* = Sum score all addition items - *sub_sum_score* = Sum score all subtraction items - *mult_sum_score* = Sum score all multiplication items - *div_sum_score* = Sum score all division items - *easy_add_sum_score* = Sum score easy addition items - *diff_add_sum_score* = Sum score difficult addition items - *easy_sub_sum_score* = Sum score easy subtraction items - *diff_sub_sum_score* = Sum score difficult subtraction items - *easy_mult_sum_score* = Sum score easy multiplication items - *diff_mult_sum_score* = Sum score difficult multiplication items - *easy_div_sum_score* = Sum score easy division items - *diff_div_sum_score* = Sum score difficult division items - *sum_err* = Sum score errors in all arithmetic operations - *add_err* = Sum score errors in addition items - *sub_err* = Sum score errors in subtraction items - *mult_err* = Sum score errors in multiplication items - *div_err* = Sum score errors in division items Exports "Math4Speed_dat_all.txt"