Analyse-It HELP

Who can help me with three questions on analyse-it toolpack when performing passing and bablok orthogonal regression.

1. There are two menus by which to start with passing and bablok A. via agreement and B. via regression. They give similar but not identical results. Which one should i use
2. How can I get a correlation coefficient using passing bablok regression
3. How can I calculate the error in slope and iontercept using passing bablok regression?

Thanx for your help.

Helen