using different variable names as outcome

[zenalapp]

• Argument in function outcome=NULL - defaults to 1st column, otherwise use column name specified
• Make sure conditional outcome is binary
• Factorize outcome column in function

Writing formulas in R:
http://www.win-vector.com/blog/2018/09/r-tip-how-to-pass-a-formula-to-lm/

[BTopcuoglu]

@zmml Would you like to do a PR if you made any changes on this? I've submitted the first release and can start working on these issues. Thank you for pointing out this issue #6.

[zenalapp]

Actually, two parts of this issue are not yet added - check if outcome is binary and factorize outcome column in function