gives accurate porosity estimates for every shallow invasion of approximately , but can be up to 5 p.u. too low for  invasions. The simple arithmetic average of the estimates, still used by many log analysts, introduces even larger errors.
The tool yields accurate porosity measurements for every minor infiltration, yet it may be as much as 5 p.u. off in its estimations for some cases. Using the simple arithmetic average of these estimates, which is frequently utilized by numerous log experts, significantly increases the potential for error.