[R] Combining two models into one

[Carl Witthoft]

You created a bunch of 'x' items but call for "X" in your formula.   That's
part of it.  Next, you don't provide a "data=x" argument in your lm() call,
so it goes off and looks for various capital-X items (I suspect).


Hint:  start with a small, simple dataset and work with it until you know
how to use lm() and R's formula syntax.  Only then go on to your full-on
model.




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