now the formula only support the simply function like: sum(x)~y|z,but can't do 100*x~y/z due to the limited parsing capability.Consider fix this by using model.frame.
Also validity check of formula by matching the data column name needs to be added to throw meaningful error message to user for invalid input.
now the formula only support the simply function like: sum(x)~y|z,but can't do 100*x~y/z due to the limited parsing capability.Consider fix this by using model.frame.
Also validity check of formula by matching the data column name needs to be added to throw meaningful error message to user for invalid input.