Icon: 
Function: logarithm
Property window:
Short description:
Compute the logarithm of many different Columns.
Long Description:
The logarithm of the selected columns is computed in the following way:
Out= ( (C+In)>0 ? log(C+In) : -1 )
…where: “In” is the input number
“Out” is the result
“C” is the parameter cox box.
“x?y:z” is the classical ternary operator.
Transforming monetary values using a log function can sometime improve the accuracy of the continuous predictive models using these monetary values.