questions concerning powertop --calibrate output

Hi,

When running 'sudo powertop --calibrate' I observe that it is calibrating idle, disk usage, backlight, CPU, USB devices and so forth.
At the end of the calibration process powertop dumps out a table
headed "Parameter state". Couple of questions about this table:

1. What does the "Value" column refer to, and what units are they being measured in? I'm trying to figure out the significance of these values.

I believe that the rows are sorted on name order and the following number in parentheses refers to the internal index number of this device. At first I thought this number had some deeper significance.

2. At the end of the table there are values annotated as "Score", "Guess" and "Actual". Again, what are these referring to?

3. At the end of the calibration process has powertop tuned the system to a more "optimal" power configuration?

Thanks for any insight,

Colin