checkFlatline(var,tolerance,window)

Sets the output to Error if the variable flatlines. If, in the number of rows indicated by window, the difference between the variable's maximum and minimum values is less than tolerance, the variable is considered flatlined. Specify a tolerance value to account for any insignificant amount of variation caused by noise in the variable. For example, if the tolerance is 0 and the window is 20, the variable may have the same value for 19 rows without generating an error, but if the variable continues unchanged for 20 rows, the 20th row will be an error.
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