ABS() returns the absolute value of a numeric expression.
Use ABS() to determine the absolute value of a population before generating a random sample.
ABS(N)
The ABS() function returns the absolute value of the specified numeric expression N.
ABS(-7.2)= 7.2
ABS(88.2)= 88.2
ABS(5)= 5
To create a field that is the difference between two fields (AMT1 and AMT2), specify:
ABS(AMT1 - AMT2)